define(function (require, exports, module) {
  /*!
 * Vue.js v2.1.10
 * (c) 2014-2017 Evan You
 * Released under the MIT License.
 */
  exports = (function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
      typeof define === 'function' && define.amd ? define(factory) :
        (global.Vue = factory());
  } (this, (function () {
    'use strict';

    /*  */

    /**
     * Convert a value to a string that is actually rendered.
     */
    function _toString(val) {
      return val == null
        ? ''
        : typeof val === 'object'
          ? JSON.stringify(val, null, 2)
          : String(val)
    }

    /**
     * Convert a input value to a number for persistence.
     * If the conversion fails, return original string.
     */
    function toNumber(val) {
      var n = parseFloat(val);
      return isNaN(n) ? val : n
    }

    /**
     * Make a map and return a function for checking if a key
     * is in that map.
     */
    function makeMap(
      str,
      expectsLowerCase
    ) {
      var map = Object.create(null);
      var list = str.split(',');
      for (var i = 0; i < list.length; i++) {
        map[list[i]] = true;
      }
      return expectsLowerCase
        ? function (val) { return map[val.toLowerCase()]; }
        : function (val) { return map[val]; }
    }

    /**
     * Check if a tag is a built-in tag.
     */
    var isBuiltInTag = makeMap('slot,component', true);

    /**
     * Remove an item from an array
     */
    function remove$1(arr, item) {
      if (arr.length) {
        var index = arr.indexOf(item);
        if (index > -1) {
          return arr.splice(index, 1)
        }
      }
    }

    /**
     * Check whether the object has the property.
     */
    var hasOwnProperty = Object.prototype.hasOwnProperty;
    function hasOwn(obj, key) {
      return hasOwnProperty.call(obj, key)
    }

    /**
     * Check if value is primitive
     */
    function isPrimitive(value) {
      return typeof value === 'string' || typeof value === 'number'
    }

    /**
     * Create a cached version of a pure function.
     */
    function cached(fn) {
      var cache = Object.create(null);
      return (function cachedFn(str) {
        var hit = cache[str];
        return hit || (cache[str] = fn(str))
      })
    }

    /**
     * Camelize a hyphen-delimited string.
     */
    var camelizeRE = /-(\w)/g;
    var camelize = cached(function (str) {
      return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
    });

    /**
     * Capitalize a string.
     */
    var capitalize = cached(function (str) {
      return str.charAt(0).toUpperCase() + str.slice(1)
    });

    /**
     * Hyphenate a camelCase string.
     */
    var hyphenateRE = /([^-])([A-Z])/g;
    var hyphenate = cached(function (str) {
      return str
        .replace(hyphenateRE, '$1-$2')
        .replace(hyphenateRE, '$1-$2')
        .toLowerCase()
    });

    /**
     * Simple bind, faster than native
     */
    function bind$1(fn, ctx) {
      function boundFn(a) {
        var l = arguments.length;
        return l
          ? l > 1
            ? fn.apply(ctx, arguments)
            : fn.call(ctx, a)
          : fn.call(ctx)
      }
      // record original fn length
      boundFn._length = fn.length;
      return boundFn
    }

    /**
     * Convert an Array-like object to a real Array.
     */
    function toArray(list, start) {
      start = start || 0;
      var i = list.length - start;
      var ret = new Array(i);
      while (i--) {
        ret[i] = list[i + start];
      }
      return ret
    }

    /**
     * Mix properties into target object.
     */
    function extend(to, _from) {
      for (var key in _from) {
        to[key] = _from[key];
      }
      return to
    }

    /**
     * Quick object check - this is primarily used to tell
     * Objects from primitive values when we know the value
     * is a JSON-compliant type.
     */
    function isObject(obj) {
      return obj !== null && typeof obj === 'object'
    }

    /**
     * Strict object type check. Only returns true
     * for plain JavaScript objects.
     */
    var toString = Object.prototype.toString;
    var OBJECT_STRING = '[object Object]';
    function isPlainObject(obj) {
      return toString.call(obj) === OBJECT_STRING
    }

    /**
     * Merge an Array of Objects into a single Object.
     */
    function toObject(arr) {
      var res = {};
      for (var i = 0; i < arr.length; i++) {
        if (arr[i]) {
          extend(res, arr[i]);
        }
      }
      return res
    }

    /**
     * Perform no operation.
     */
    function noop() { }

    /**
     * Always return false.
     */
    var no = function () { return false; };

    /**
     * Return same value
     */
    var identity = function (_) { return _; };

    /**
     * Generate a static keys string from compiler modules.
     */
    function genStaticKeys(modules) {
      return modules.reduce(function (keys, m) {
        return keys.concat(m.staticKeys || [])
      }, []).join(',')
    }

    /**
     * Check if two values are loosely equal - that is,
     * if they are plain objects, do they have the same shape?
     */
    function looseEqual(a, b) {
      var isObjectA = isObject(a);
      var isObjectB = isObject(b);
      if (isObjectA && isObjectB) {
        return JSON.stringify(a) === JSON.stringify(b)
      } else if (!isObjectA && !isObjectB) {
        return String(a) === String(b)
      } else {
        return false
      }
    }

    function looseIndexOf(arr, val) {
      for (var i = 0; i < arr.length; i++) {
        if (looseEqual(arr[i], val)) { return i }
      }
      return -1
    }

    /*  */

    var config = {
      /**
       * Option merge strategies (used in core/util/options)
       */
      optionMergeStrategies: Object.create(null),

      /**
       * Whether to suppress warnings.
       */
      silent: false,

      /**
       * Whether to enable devtools
       */
      devtools: "development" !== 'production',

      /**
       * Error handler for watcher errors
       */
      errorHandler: null,

      /**
       * Ignore certain custom elements
       */
      ignoredElements: [],

      /**
       * Custom user key aliases for v-on
       */
      keyCodes: Object.create(null),

      /**
       * Check if a tag is reserved so that it cannot be registered as a
       * component. This is platform-dependent and may be overwritten.
       */
      isReservedTag: no,

      /**
       * Check if a tag is an unknown element.
       * Platform-dependent.
       */
      isUnknownElement: no,

      /**
       * Get the namespace of an element
       */
      getTagNamespace: noop,

      /**
       * Parse the real tag name for the specific platform.
       */
      parsePlatformTagName: identity,

      /**
       * Check if an attribute must be bound using property, e.g. value
       * Platform-dependent.
       */
      mustUseProp: no,

      /**
       * List of asset types that a component can own.
       */
      _assetTypes: [
        'component',
        'directive',
        'filter'
      ],

      /**
       * List of lifecycle hooks.
       */
      _lifecycleHooks: [
        'beforeCreate',
        'created',
        'beforeMount',
        'mounted',
        'beforeUpdate',
        'updated',
        'beforeDestroy',
        'destroyed',
        'activated',
        'deactivated'
      ],

      /**
       * Max circular updates allowed in a scheduler flush cycle.
       */
      _maxUpdateCount: 100
    };

    /*  */

    /**
     * Check if a string starts with $ or _
     */
    function isReserved(str) {
      var c = (str + '').charCodeAt(0);
      return c === 0x24 || c === 0x5F
    }

    /**
     * Define a property.
     */
    function def(obj, key, val, enumerable) {
      Object.defineProperty(obj, key, {
        value: val,
        enumerable: !!enumerable,
        writable: true,
        configurable: true
      });
    }

    /**
     * Parse simple path.
     */
    var bailRE = /[^\w.$]/;
    function parsePath(path) {
      if (bailRE.test(path)) {
        return
      } else {
        var segments = path.split('.');
        return function (obj) {
          for (var i = 0; i < segments.length; i++) {
            if (!obj) { return }
            obj = obj[segments[i]];
          }
          return obj
        }
      }
    }

    /*  */
    /* globals MutationObserver */

    // can we use __proto__?
    var hasProto = '__proto__' in {};

    // Browser environment sniffing
    var inBrowser = typeof window !== 'undefined';
    var UA = inBrowser && window.navigator.userAgent.toLowerCase();
    var isIE = UA && /msie|trident/.test(UA);
    var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
    var isEdge = UA && UA.indexOf('edge/') > 0;
    var isAndroid = UA && UA.indexOf('android') > 0;
    var isIOS = UA && /iphone|ipad|ipod|ios/.test(UA);

    // this needs to be lazy-evaled because vue may be required before
    // vue-server-renderer can set VUE_ENV
    var _isServer;
    var isServerRendering = function () {
      if (_isServer === undefined) {
        /* istanbul ignore if */
        if (!inBrowser && typeof global !== 'undefined') {
          // detect presence of vue-server-renderer and avoid
          // Webpack shimming the process
          _isServer = global['process'].env.VUE_ENV === 'server';
        } else {
          _isServer = false;
        }
      }
      return _isServer
    };

    // detect devtools
    var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

    /* istanbul ignore next */
    function isNative(Ctor) {
      return /native code/.test(Ctor.toString())
    }

    /**
     * Defer a task to execute it asynchronously.
     */
    var nextTick = (function () {
      var callbacks = [];
      var pending = false;
      var timerFunc;

      function nextTickHandler() {
        pending = false;
        var copies = callbacks.slice(0);
        callbacks.length = 0;
        for (var i = 0; i < copies.length; i++) {
          copies[i]();
        }
      }

      // the nextTick behavior leverages the microtask queue, which can be accessed
      // via either native Promise.then or MutationObserver.
      // MutationObserver has wider support, however it is seriously bugged in
      // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
      // completely stops working after triggering a few times... so, if native
      // Promise is available, we will use it:
      /* istanbul ignore if */
      if (typeof Promise !== 'undefined' && isNative(Promise)) {
        var p = Promise.resolve();
        var logError = function (err) { console.error(err); };
        timerFunc = function () {
          p.then(nextTickHandler).catch(logError);
          // in problematic UIWebViews, Promise.then doesn't completely break, but
          // it can get stuck in a weird state where callbacks are pushed into the
          // microtask queue but the queue isn't being flushed, until the browser
          // needs to do some other work, e.g. handle a timer. Therefore we can
          // "force" the microtask queue to be flushed by adding an empty timer.
          if (isIOS) { setTimeout(noop); }
        };
      } else if (typeof MutationObserver !== 'undefined' && (
        isNative(MutationObserver) ||
        // PhantomJS and iOS 7.x
        MutationObserver.toString() === '[object MutationObserverConstructor]'
      )) {
        // use MutationObserver where native Promise is not available,
        // e.g. PhantomJS IE11, iOS7, Android 4.4
        var counter = 1;
        var observer = new MutationObserver(nextTickHandler);
        var textNode = document.createTextNode(String(counter));
        observer.observe(textNode, {
          characterData: true
        });
        timerFunc = function () {
          counter = (counter + 1) % 2;
          textNode.data = String(counter);
        };
      } else {
        // fallback to setTimeout
        /* istanbul ignore next */
        timerFunc = function () {
          setTimeout(nextTickHandler, 0);
        };
      }

      return function queueNextTick(cb, ctx) {
        var _resolve;
        callbacks.push(function () {
          if (cb) { cb.call(ctx); }
          if (_resolve) { _resolve(ctx); }
        });
        if (!pending) {
          pending = true;
          timerFunc();
        }
        if (!cb && typeof Promise !== 'undefined') {
          return new Promise(function (resolve) {
            _resolve = resolve;
          })
        }
      }
    })();

    var _Set;
    /* istanbul ignore if */
    if (typeof Set !== 'undefined' && isNative(Set)) {
      // use native Set when available.
      _Set = Set;
    } else {
      // a non-standard Set polyfill that only works with primitive keys.
      _Set = (function () {
        function Set() {
          this.set = Object.create(null);
        }
        Set.prototype.has = function has(key) {
          return this.set[key] === true
        };
        Set.prototype.add = function add(key) {
          this.set[key] = true;
        };
        Set.prototype.clear = function clear() {
          this.set = Object.create(null);
        };

        return Set;
      } ());
    }

    var warn = noop;
    var formatComponentName;

    {
      var hasConsole = typeof console !== 'undefined';

      warn = function (msg, vm) {
        if (hasConsole && (!config.silent)) {
          console.error("[Vue warn]: " + msg + " " + (
            vm ? formatLocation(formatComponentName(vm)) : ''
          ));
        }
      };

      formatComponentName = function (vm) {
        if (vm.$root === vm) {
          return 'root instance'
        }
        var name = vm._isVue
          ? vm.$options.name || vm.$options._componentTag
          : vm.name;
        return (
          (name ? ("component <" + name + ">") : "anonymous component") +
          (vm._isVue && vm.$options.__file ? (" at " + (vm.$options.__file)) : '')
        )
      };

      var formatLocation = function (str) {
        if (str === 'anonymous component') {
          str += " - use the \"name\" option for better debugging messages.";
        }
        return ("\n(found in " + str + ")")
      };
    }

    /*  */


    var uid$1 = 0;

    /**
     * A dep is an observable that can have multiple
     * directives subscribing to it.
     */
    var Dep = function Dep() {
      this.id = uid$1++;
      this.subs = [];
    };

    Dep.prototype.addSub = function addSub(sub) {
      this.subs.push(sub);
    };

    Dep.prototype.removeSub = function removeSub(sub) {
      remove$1(this.subs, sub);
    };

    Dep.prototype.depend = function depend() {
      if (Dep.target) {
        Dep.target.addDep(this);
      }
    };

    Dep.prototype.notify = function notify() {
      // stablize the subscriber list first
      var subs = this.subs.slice();
      for (var i = 0, l = subs.length; i < l; i++) {
        subs[i].update();
      }
    };

    // the current target watcher being evaluated.
    // this is globally unique because there could be only one
    // watcher being evaluated at any time.
    Dep.target = null;
    var targetStack = [];

    function pushTarget(_target) {
      if (Dep.target) { targetStack.push(Dep.target); }
      Dep.target = _target;
    }

    function popTarget() {
      Dep.target = targetStack.pop();
    }

    /*
     * not type checking this file because flow doesn't play well with
     * dynamically accessing methods on Array prototype
     */

    var arrayProto = Array.prototype;
    var arrayMethods = Object.create(arrayProto);[
      'push',
      'pop',
      'shift',
      'unshift',
      'splice',
      'sort',
      'reverse'
    ]
      .forEach(function (method) {
        // cache original method
        var original = arrayProto[method];
        def(arrayMethods, method, function mutator() {
          var arguments$1 = arguments;

          // avoid leaking arguments:
          // http://jsperf.com/closure-with-arguments
          var i = arguments.length;
          var args = new Array(i);
          while (i--) {
            args[i] = arguments$1[i];
          }
          var result = original.apply(this, args);
          var ob = this.__ob__;
          var inserted;
          switch (method) {
            case 'push':
              inserted = args;
              break
            case 'unshift':
              inserted = args;
              break
            case 'splice':
              inserted = args.slice(2);
              break
          }
          if (inserted) { ob.observeArray(inserted); }
          // notify change
          ob.dep.notify();
          return result
        });
      });

    /*  */

    var arrayKeys = Object.getOwnPropertyNames(arrayMethods);

    /**
     * By default, when a reactive property is set, the new value is
     * also converted to become reactive. However when passing down props,
     * we don't want to force conversion because the value may be a nested value
     * under a frozen data structure. Converting it would defeat the optimization.
     */
    var observerState = {
      shouldConvert: true,
      isSettingProps: false
    };

    /**
     * Observer class that are attached to each observed
     * object. Once attached, the observer converts target
     * object's property keys into getter/setters that
     * collect dependencies and dispatches updates.
     */
    var Observer = function Observer(value) {
      this.value = value;
      this.dep = new Dep();
      this.vmCount = 0;
      def(value, '__ob__', this);
      if (Array.isArray(value)) {
        var augment = hasProto
          ? protoAugment
          : copyAugment;
        augment(value, arrayMethods, arrayKeys);
        this.observeArray(value);
      } else {
        this.walk(value);
      }
    };

    /**
     * Walk through each property and convert them into
     * getter/setters. This method should only be called when
     * value type is Object.
     */
    Observer.prototype.walk = function walk(obj) {
      var keys = Object.keys(obj);
      for (var i = 0; i < keys.length; i++) {
        defineReactive$$1(obj, keys[i], obj[keys[i]]);
      }
    };

    /**
     * Observe a list of Array items.
     */
    Observer.prototype.observeArray = function observeArray(items) {
      for (var i = 0, l = items.length; i < l; i++) {
        observe(items[i]);
      }
    };

    // helpers

    /**
     * Augment an target Object or Array by intercepting
     * the prototype chain using __proto__
     */
    function protoAugment(target, src) {
      /* eslint-disable no-proto */
      target.__proto__ = src;
      /* eslint-enable no-proto */
    }

    /**
     * Augment an target Object or Array by defining
     * hidden properties.
     */
    /* istanbul ignore next */
    function copyAugment(target, src, keys) {
      for (var i = 0, l = keys.length; i < l; i++) {
        var key = keys[i];
        def(target, key, src[key]);
      }
    }

    /**
     * Attempt to create an observer instance for a value,
     * returns the new observer if successfully observed,
     * or the existing observer if the value already has one.
     */
    function observe(value, asRootData) {
      if (!isObject(value)) {
        return
      }
      var ob;
      if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
        ob = value.__ob__;
      } else if (
        observerState.shouldConvert &&
        !isServerRendering() &&
        (Array.isArray(value) || isPlainObject(value)) &&
        Object.isExtensible(value) &&
        !value._isVue
      ) {
        ob = new Observer(value);
      }
      if (asRootData && ob) {
        ob.vmCount++;
      }
      return ob
    }

    /**
     * Define a reactive property on an Object.
     */
    function defineReactive$$1(
      obj,
      key,
      val,
      customSetter
    ) {
      var dep = new Dep();

      var property = Object.getOwnPropertyDescriptor(obj, key);
      if (property && property.configurable === false) {
        return
      }

      // cater for pre-defined getter/setters
      var getter = property && property.get;
      var setter = property && property.set;

      var childOb = observe(val);
      Object.defineProperty(obj, key, {
        enumerable: true,
        configurable: true,
        get: function reactiveGetter() {
          var value = getter ? getter.call(obj) : val;
          if (Dep.target) {
            dep.depend();
            if (childOb) {
              childOb.dep.depend();
            }
            if (Array.isArray(value)) {
              dependArray(value);
            }
          }
          return value
        },
        set: function reactiveSetter(newVal) {
          var value = getter ? getter.call(obj) : val;
          /* eslint-disable no-self-compare */
          if (newVal === value || (newVal !== newVal && value !== value)) {
            return
          }
          /* eslint-enable no-self-compare */
          if ("development" !== 'production' && customSetter) {
            customSetter();
          }
          if (setter) {
            setter.call(obj, newVal);
          } else {
            val = newVal;
          }
          childOb = observe(newVal);
          dep.notify();
        }
      });
    }

    /**
     * Set a property on an object. Adds the new property and
     * triggers change notification if the property doesn't
     * already exist.
     */
    function set$1(obj, key, val) {
      if (Array.isArray(obj)) {
        obj.length = Math.max(obj.length, key);
        obj.splice(key, 1, val);
        return val
      }
      if (hasOwn(obj, key)) {
        obj[key] = val;
        return
      }
      var ob = obj.__ob__;
      if (obj._isVue || (ob && ob.vmCount)) {
        "development" !== 'production' && warn(
          'Avoid adding reactive properties to a Vue instance or its root $data ' +
          'at runtime - declare it upfront in the data option.'
        );
        return
      }
      if (!ob) {
        obj[key] = val;
        return
      }
      defineReactive$$1(ob.value, key, val);
      ob.dep.notify();
      return val
    }

    /**
     * Delete a property and trigger change if necessary.
     */
    function del(obj, key) {
      var ob = obj.__ob__;
      if (obj._isVue || (ob && ob.vmCount)) {
        "development" !== 'production' && warn(
          'Avoid deleting properties on a Vue instance or its root $data ' +
          '- just set it to null.'
        );
        return
      }
      if (!hasOwn(obj, key)) {
        return
      }
      delete obj[key];
      if (!ob) {
        return
      }
      ob.dep.notify();
    }

    /**
     * Collect dependencies on array elements when the array is touched, since
     * we cannot intercept array element access like property getters.
     */
    function dependArray(value) {
      for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
        e = value[i];
        e && e.__ob__ && e.__ob__.dep.depend();
        if (Array.isArray(e)) {
          dependArray(e);
        }
      }
    }

    /*  */

    /**
     * Option overwriting strategies are functions that handle
     * how to merge a parent option value and a child option
     * value into the final value.
     */
    var strats = config.optionMergeStrategies;

    /**
     * Options with restrictions
     */
    {
      strats.el = strats.propsData = function (parent, child, vm, key) {
        if (!vm) {
          warn(
            "option \"" + key + "\" can only be used during instance " +
            'creation with the `new` keyword.'
          );
        }
        return defaultStrat(parent, child)
      };
    }

    /**
     * Helper that recursively merges two data objects together.
     */
    function mergeData(to, from) {
      if (!from) { return to }
      var key, toVal, fromVal;
      var keys = Object.keys(from);
      for (var i = 0; i < keys.length; i++) {
        key = keys[i];
        toVal = to[key];
        fromVal = from[key];
        if (!hasOwn(to, key)) {
          set$1(to, key, fromVal);
        } else if (isPlainObject(toVal) && isPlainObject(fromVal)) {
          mergeData(toVal, fromVal);
        }
      }
      return to
    }

    /**
     * Data
     */
    strats.data = function (
      parentVal,
      childVal,
      vm
    ) {
      if (!vm) {
        // in a Vue.extend merge, both should be functions
        if (!childVal) {
          return parentVal
        }
        if (typeof childVal !== 'function') {
          "development" !== 'production' && warn(
            'The "data" option should be a function ' +
            'that returns a per-instance value in component ' +
            'definitions.',
            vm
          );
          return parentVal
        }
        if (!parentVal) {
          return childVal
        }
        // when parentVal & childVal are both present,
        // we need to return a function that returns the
        // merged result of both functions... no need to
        // check if parentVal is a function here because
        // it has to be a function to pass previous merges.
        return function mergedDataFn() {
          return mergeData(
            childVal.call(this),
            parentVal.call(this)
          )
        }
      } else if (parentVal || childVal) {
        return function mergedInstanceDataFn() {
          // instance merge
          var instanceData = typeof childVal === 'function'
            ? childVal.call(vm)
            : childVal;
          var defaultData = typeof parentVal === 'function'
            ? parentVal.call(vm)
            : undefined;
          if (instanceData) {
            return mergeData(instanceData, defaultData)
          } else {
            return defaultData
          }
        }
      }
    };

    /**
     * Hooks and param attributes are merged as arrays.
     */
    function mergeHook(
      parentVal,
      childVal
    ) {
      return childVal
        ? parentVal
          ? parentVal.concat(childVal)
          : Array.isArray(childVal)
            ? childVal
            : [childVal]
        : parentVal
    }

    config._lifecycleHooks.forEach(function (hook) {
      strats[hook] = mergeHook;
    });

    /**
     * Assets
     *
     * When a vm is present (instance creation), we need to do
     * a three-way merge between constructor options, instance
     * options and parent options.
     */
    function mergeAssets(parentVal, childVal) {
      var res = Object.create(parentVal || null);
      return childVal
        ? extend(res, childVal)
        : res
    }

    config._assetTypes.forEach(function (type) {
      strats[type + 's'] = mergeAssets;
    });

    /**
     * Watchers.
     *
     * Watchers hashes should not overwrite one
     * another, so we merge them as arrays.
     */
    strats.watch = function (parentVal, childVal) {
      /* istanbul ignore if */
      if (!childVal) { return parentVal }
      if (!parentVal) { return childVal }
      var ret = {};
      extend(ret, parentVal);
      for (var key in childVal) {
        var parent = ret[key];
        var child = childVal[key];
        if (parent && !Array.isArray(parent)) {
          parent = [parent];
        }
        ret[key] = parent
          ? parent.concat(child)
          : [child];
      }
      return ret
    };

    /**
     * Other object hashes.
     */
    strats.props =
      strats.methods =
      strats.computed = function (parentVal, childVal) {
        if (!childVal) { return parentVal }
        if (!parentVal) { return childVal }
        var ret = Object.create(null);
        extend(ret, parentVal);
        extend(ret, childVal);
        return ret
      };

    /**
     * Default strategy.
     */
    var defaultStrat = function (parentVal, childVal) {
      return childVal === undefined
        ? parentVal
        : childVal
    };

    /**
     * Validate component names
     */
    function checkComponents(options) {
      for (var key in options.components) {
        var lower = key.toLowerCase();
        if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
          warn(
            'Do not use built-in or reserved HTML elements as component ' +
            'id: ' + key
          );
        }
      }
    }

    /**
     * Ensure all props option syntax are normalized into the
     * Object-based format.
     */
    function normalizeProps(options) {
      var props = options.props;
      if (!props) { return }
      var res = {};
      var i, val, name;
      if (Array.isArray(props)) {
        i = props.length;
        while (i--) {
          val = props[i];
          if (typeof val === 'string') {
            name = camelize(val);
            res[name] = { type: null };
          } else {
            warn('props must be strings when using array syntax.');
          }
        }
      } else if (isPlainObject(props)) {
        for (var key in props) {
          val = props[key];
          name = camelize(key);
          res[name] = isPlainObject(val)
            ? val
            : { type: val };
        }
      }
      options.props = res;
    }

    /**
     * Normalize raw function directives into object format.
     */
    function normalizeDirectives(options) {
      var dirs = options.directives;
      if (dirs) {
        for (var key in dirs) {
          var def = dirs[key];
          if (typeof def === 'function') {
            dirs[key] = { bind: def, update: def };
          }
        }
      }
    }

    /**
     * Merge two option objects into a new one.
     * Core utility used in both instantiation and inheritance.
     */
    function mergeOptions(
      parent,
      child,
      vm
    ) {
      {
        checkComponents(child);
      }
      normalizeProps(child);
      normalizeDirectives(child);
      var extendsFrom = child.extends;
      if (extendsFrom) {
        parent = typeof extendsFrom === 'function'
          ? mergeOptions(parent, extendsFrom.options, vm)
          : mergeOptions(parent, extendsFrom, vm);
      }
      if (child.mixins) {
        for (var i = 0, l = child.mixins.length; i < l; i++) {
          var mixin = child.mixins[i];
          if (mixin.prototype instanceof Vue$3) {
            mixin = mixin.options;
          }
          parent = mergeOptions(parent, mixin, vm);
        }
      }
      var options = {};
      var key;
      for (key in parent) {
        mergeField(key);
      }
      for (key in child) {
        if (!hasOwn(parent, key)) {
          mergeField(key);
        }
      }
      function mergeField(key) {
        var strat = strats[key] || defaultStrat;
        options[key] = strat(parent[key], child[key], vm, key);
      }
      return options
    }

    /**
     * Resolve an asset.
     * This function is used because child instances need access
     * to assets defined in its ancestor chain.
     */
    function resolveAsset(
      options,
      type,
      id,
      warnMissing
    ) {
      /* istanbul ignore if */
      if (typeof id !== 'string') {
        return
      }
      var assets = options[type];
      // check local registration variations first
      if (hasOwn(assets, id)) { return assets[id] }
      var camelizedId = camelize(id);
      if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
      var PascalCaseId = capitalize(camelizedId);
      if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
      // fallback to prototype chain
      var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
      if ("development" !== 'production' && warnMissing && !res) {
        warn(
          'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
          options
        );
      }
      return res
    }

    /*  */

    function validateProp(
      key,
      propOptions,
      propsData,
      vm
    ) {
      var prop = propOptions[key];
      var absent = !hasOwn(propsData, key);
      var value = propsData[key];
      // handle boolean props
      if (isType(Boolean, prop.type)) {
        if (absent && !hasOwn(prop, 'default')) {
          value = false;
        } else if (!isType(String, prop.type) && (value === '' || value === hyphenate(key))) {
          value = true;
        }
      }
      // check default value
      if (value === undefined) {
        value = getPropDefaultValue(vm, prop, key);
        // since the default value is a fresh copy,
        // make sure to observe it.
        var prevShouldConvert = observerState.shouldConvert;
        observerState.shouldConvert = true;
        observe(value);
        observerState.shouldConvert = prevShouldConvert;
      }
      {
        assertProp(prop, key, value, vm, absent);
      }
      return value
    }

    /**
     * Get the default value of a prop.
     */
    function getPropDefaultValue(vm, prop, key) {
      // no default, return undefined
      if (!hasOwn(prop, 'default')) {
        return undefined
      }
      var def = prop.default;
      // warn against non-factory defaults for Object & Array
      if (isObject(def)) {
        "development" !== 'production' && warn(
          'Invalid default value for prop "' + key + '": ' +
          'Props with type Object/Array must use a factory function ' +
          'to return the default value.',
          vm
        );
      }
      // the raw prop value was also undefined from previous render,
      // return previous default value to avoid unnecessary watcher trigger
      if (vm && vm.$options.propsData &&
        vm.$options.propsData[key] === undefined &&
        vm[key] !== undefined) {
        return vm[key]
      }
      // call factory function for non-Function types
      return typeof def === 'function' && prop.type !== Function
        ? def.call(vm)
        : def
    }

    /**
     * Assert whether a prop is valid.
     */
    function assertProp(
      prop,
      name,
      value,
      vm,
      absent
    ) {
      if (prop.required && absent) {
        warn(
          'Missing required prop: "' + name + '"',
          vm
        );
        return
      }
      if (value == null && !prop.required) {
        return
      }
      var type = prop.type;
      var valid = !type || type === true;
      var expectedTypes = [];
      if (type) {
        if (!Array.isArray(type)) {
          type = [type];
        }
        for (var i = 0; i < type.length && !valid; i++) {
          var assertedType = assertType(value, type[i]);
          expectedTypes.push(assertedType.expectedType || '');
          valid = assertedType.valid;
        }
      }
      if (!valid) {
        warn(
          'Invalid prop: type check failed for prop "' + name + '".' +
          ' Expected ' + expectedTypes.map(capitalize).join(', ') +
          ', got ' + Object.prototype.toString.call(value).slice(8, -1) + '.',
          vm
        );
        return
      }
      var validator = prop.validator;
      if (validator) {
        if (!validator(value)) {
          warn(
            'Invalid prop: custom validator check failed for prop "' + name + '".',
            vm
          );
        }
      }
    }

    /**
     * Assert the type of a value
     */
    function assertType(value, type) {
      var valid;
      var expectedType = getType(type);
      if (expectedType === 'String') {
        valid = typeof value === (expectedType = 'string');
      } else if (expectedType === 'Number') {
        valid = typeof value === (expectedType = 'number');
      } else if (expectedType === 'Boolean') {
        valid = typeof value === (expectedType = 'boolean');
      } else if (expectedType === 'Function') {
        valid = typeof value === (expectedType = 'function');
      } else if (expectedType === 'Object') {
        valid = isPlainObject(value);
      } else if (expectedType === 'Array') {
        valid = Array.isArray(value);
      } else {
        valid = value instanceof type;
      }
      return {
        valid: valid,
        expectedType: expectedType
      }
    }

    /**
     * Use function string name to check built-in types,
     * because a simple equality check will fail when running
     * across different vms / iframes.
     */
    function getType(fn) {
      var match = fn && fn.toString().match(/^\s*function (\w+)/);
      return match && match[1]
    }

    function isType(type, fn) {
      if (!Array.isArray(fn)) {
        return getType(fn) === getType(type)
      }
      for (var i = 0, len = fn.length; i < len; i++) {
        if (getType(fn[i]) === getType(type)) {
          return true
        }
      }
      /* istanbul ignore next */
      return false
    }



    var util = Object.freeze({
      defineReactive: defineReactive$$1,
      _toString: _toString,
      toNumber: toNumber,
      makeMap: makeMap,
      isBuiltInTag: isBuiltInTag,
      remove: remove$1,
      hasOwn: hasOwn,
      isPrimitive: isPrimitive,
      cached: cached,
      camelize: camelize,
      capitalize: capitalize,
      hyphenate: hyphenate,
      bind: bind$1,
      toArray: toArray,
      extend: extend,
      isObject: isObject,
      isPlainObject: isPlainObject,
      toObject: toObject,
      noop: noop,
      no: no,
      identity: identity,
      genStaticKeys: genStaticKeys,
      looseEqual: looseEqual,
      looseIndexOf: looseIndexOf,
      isReserved: isReserved,
      def: def,
      parsePath: parsePath,
      hasProto: hasProto,
      inBrowser: inBrowser,
      UA: UA,
      isIE: isIE,
      isIE9: isIE9,
      isEdge: isEdge,
      isAndroid: isAndroid,
      isIOS: isIOS,
      isServerRendering: isServerRendering,
      devtools: devtools,
      nextTick: nextTick,
      get _Set() { return _Set; },
      mergeOptions: mergeOptions,
      resolveAsset: resolveAsset,
      get warn() { return warn; },
      get formatComponentName() { return formatComponentName; },
      validateProp: validateProp
    });

    /* not type checking this file because flow doesn't play well with Proxy */

    var initProxy;

    {
      var allowedGlobals = makeMap(
        'Infinity,undefined,NaN,isFinite,isNaN,' +
        'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
        'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
        'require' // for Webpack/Browserify
      );

      var warnNonPresent = function (target, key) {
        warn(
          "Property or method \"" + key + "\" is not defined on the instance but " +
          "referenced during render. Make sure to declare reactive data " +
          "properties in the data option.",
          target
        );
      };

      var hasProxy =
        typeof Proxy !== 'undefined' &&
        Proxy.toString().match(/native code/);

      if (hasProxy) {
        var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta');
        config.keyCodes = new Proxy(config.keyCodes, {
          set: function set(target, key, value) {
            if (isBuiltInModifier(key)) {
              warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
              return false
            } else {
              target[key] = value;
              return true
            }
          }
        });
      }

      var hasHandler = {
        has: function has(target, key) {
          var has = key in target;
          var isAllowed = allowedGlobals(key) || key.charAt(0) === '_';
          if (!has && !isAllowed) {
            warnNonPresent(target, key);
          }
          return has || !isAllowed
        }
      };

      var getHandler = {
        get: function get(target, key) {
          if (typeof key === 'string' && !(key in target)) {
            warnNonPresent(target, key);
          }
          return target[key]
        }
      };

      initProxy = function initProxy(vm) {
        if (hasProxy) {
          // determine which proxy handler to use
          var options = vm.$options;
          var handlers = options.render && options.render._withStripped
            ? getHandler
            : hasHandler;
          vm._renderProxy = new Proxy(vm, handlers);
        } else {
          vm._renderProxy = vm;
        }
      };
    }

    /*  */

    var VNode = function VNode(
      tag,
      data,
      children,
      text,
      elm,
      context,
      componentOptions
    ) {
      this.tag = tag;
      this.data = data;
      this.children = children;
      this.text = text;
      this.elm = elm;
      this.ns = undefined;
      this.context = context;
      this.functionalContext = undefined;
      this.key = data && data.key;
      this.componentOptions = componentOptions;
      this.componentInstance = undefined;
      this.parent = undefined;
      this.raw = false;
      this.isStatic = false;
      this.isRootInsert = true;
      this.isComment = false;
      this.isCloned = false;
      this.isOnce = false;
    };

    var prototypeAccessors = { child: {} };

    // DEPRECATED: alias for componentInstance for backwards compat.
    /* istanbul ignore next */
    prototypeAccessors.child.get = function () {
      return this.componentInstance
    };

    Object.defineProperties(VNode.prototype, prototypeAccessors);

    var createEmptyVNode = function () {
      var node = new VNode();
      node.text = '';
      node.isComment = true;
      return node
    };

    function createTextVNode(val) {
      return new VNode(undefined, undefined, undefined, String(val))
    }

    // optimized shallow clone
    // used for static nodes and slot nodes because they may be reused across
    // multiple renders, cloning them avoids errors when DOM manipulations rely
    // on their elm reference.
    function cloneVNode(vnode) {
      var cloned = new VNode(
        vnode.tag,
        vnode.data,
        vnode.children,
        vnode.text,
        vnode.elm,
        vnode.context,
        vnode.componentOptions
      );
      cloned.ns = vnode.ns;
      cloned.isStatic = vnode.isStatic;
      cloned.key = vnode.key;
      cloned.isCloned = true;
      return cloned
    }

    function cloneVNodes(vnodes) {
      var res = new Array(vnodes.length);
      for (var i = 0; i < vnodes.length; i++) {
        res[i] = cloneVNode(vnodes[i]);
      }
      return res
    }

    /*  */

    var hooks = { init: init, prepatch: prepatch, insert: insert, destroy: destroy$1 };
    var hooksToMerge = Object.keys(hooks);

    function createComponent(
      Ctor,
      data,
      context,
      children,
      tag
    ) {
      if (!Ctor) {
        return
      }

      var baseCtor = context.$options._base;
      if (isObject(Ctor)) {
        Ctor = baseCtor.extend(Ctor);
      }

      if (typeof Ctor !== 'function') {
        {
          warn(("Invalid Component definition: " + (String(Ctor))), context);
        }
        return
      }

      // async component
      if (!Ctor.cid) {
        if (Ctor.resolved) {
          Ctor = Ctor.resolved;
        } else {
          Ctor = resolveAsyncComponent(Ctor, baseCtor, function () {
            // it's ok to queue this on every render because
            // $forceUpdate is buffered by the scheduler.
            context.$forceUpdate();
          });
          if (!Ctor) {
            // return nothing if this is indeed an async component
            // wait for the callback to trigger parent update.
            return
          }
        }
      }

      // resolve constructor options in case global mixins are applied after
      // component constructor creation
      resolveConstructorOptions(Ctor);

      data = data || {};

      // extract props
      var propsData = extractProps(data, Ctor);

      // functional component
      if (Ctor.options.functional) {
        return createFunctionalComponent(Ctor, propsData, data, context, children)
      }

      // extract listeners, since these needs to be treated as
      // child component listeners instead of DOM listeners
      var listeners = data.on;
      // replace with listeners with .native modifier
      data.on = data.nativeOn;

      if (Ctor.options.abstract) {
        // abstract components do not keep anything
        // other than props & listeners
        data = {};
      }

      // merge component management hooks onto the placeholder node
      mergeHooks(data);

      // return a placeholder vnode
      var name = Ctor.options.name || tag;
      var vnode = new VNode(
        ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
        data, undefined, undefined, undefined, context,
        { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children }
      );
      return vnode
    }

    function createFunctionalComponent(
      Ctor,
      propsData,
      data,
      context,
      children
    ) {
      var props = {};
      var propOptions = Ctor.options.props;
      if (propOptions) {
        for (var key in propOptions) {
          props[key] = validateProp(key, propOptions, propsData);
        }
      }
      // ensure the createElement function in functional components
      // gets a unique context - this is necessary for correct named slot check
      var _context = Object.create(context);
      var h = function (a, b, c, d) { return createElement(_context, a, b, c, d, true); };
      var vnode = Ctor.options.render.call(null, h, {
        props: props,
        data: data,
        parent: context,
        children: children,
        slots: function () { return resolveSlots(children, context); }
      });
      if (vnode instanceof VNode) {
        vnode.functionalContext = context;
        if (data.slot) {
          (vnode.data || (vnode.data = {})).slot = data.slot;
        }
      }
      return vnode
    }

    function createComponentInstanceForVnode(
      vnode, // we know it's MountedComponentVNode but flow doesn't
      parent, // activeInstance in lifecycle state
      parentElm,
      refElm
    ) {
      var vnodeComponentOptions = vnode.componentOptions;
      var options = {
        _isComponent: true,
        parent: parent,
        propsData: vnodeComponentOptions.propsData,
        _componentTag: vnodeComponentOptions.tag,
        _parentVnode: vnode,
        _parentListeners: vnodeComponentOptions.listeners,
        _renderChildren: vnodeComponentOptions.children,
        _parentElm: parentElm || null,
        _refElm: refElm || null
      };
      // check inline-template render functions
      var inlineTemplate = vnode.data.inlineTemplate;
      if (inlineTemplate) {
        options.render = inlineTemplate.render;
        options.staticRenderFns = inlineTemplate.staticRenderFns;
      }
      return new vnodeComponentOptions.Ctor(options)
    }

    function init(
      vnode,
      hydrating,
      parentElm,
      refElm
    ) {
      if (!vnode.componentInstance || vnode.componentInstance._isDestroyed) {
        var child = vnode.componentInstance = createComponentInstanceForVnode(
          vnode,
          activeInstance,
          parentElm,
          refElm
        );
        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
      } else if (vnode.data.keepAlive) {
        // kept-alive components, treat as a patch
        var mountedNode = vnode; // work around flow
        prepatch(mountedNode, mountedNode);
      }
    }

    function prepatch(
      oldVnode,
      vnode
    ) {
      var options = vnode.componentOptions;
      var child = vnode.componentInstance = oldVnode.componentInstance;
      child._updateFromParent(
        options.propsData, // updated props
        options.listeners, // updated listeners
        vnode, // new parent vnode
        options.children // new children
      );
    }

    function insert(vnode) {
      if (!vnode.componentInstance._isMounted) {
        vnode.componentInstance._isMounted = true;
        callHook(vnode.componentInstance, 'mounted');
      }
      if (vnode.data.keepAlive) {
        vnode.componentInstance._inactive = false;
        callHook(vnode.componentInstance, 'activated');
      }
    }

    function destroy$1(vnode) {
      if (!vnode.componentInstance._isDestroyed) {
        if (!vnode.data.keepAlive) {
          vnode.componentInstance.$destroy();
        } else {
          vnode.componentInstance._inactive = true;
          callHook(vnode.componentInstance, 'deactivated');
        }
      }
    }

    function resolveAsyncComponent(
      factory,
      baseCtor,
      cb
    ) {
      if (factory.requested) {
        // pool callbacks
        factory.pendingCallbacks.push(cb);
      } else {
        factory.requested = true;
        var cbs = factory.pendingCallbacks = [cb];
        var sync = true;

        var resolve = function (res) {
          if (isObject(res)) {
            res = baseCtor.extend(res);
          }
          // cache resolved
          factory.resolved = res;
          // invoke callbacks only if this is not a synchronous resolve
          // (async resolves are shimmed as synchronous during SSR)
          if (!sync) {
            for (var i = 0, l = cbs.length; i < l; i++) {
              cbs[i](res);
            }
          }
        };

        var reject = function (reason) {
          "development" !== 'production' && warn(
            "Failed to resolve async component: " + (String(factory)) +
            (reason ? ("\nReason: " + reason) : '')
          );
        };

        var res = factory(resolve, reject);

        // handle promise
        if (res && typeof res.then === 'function' && !factory.resolved) {
          res.then(resolve, reject);
        }

        sync = false;
        // return in case resolved synchronously
        return factory.resolved
      }
    }

    function extractProps(data, Ctor) {
      // we are only extracting raw values here.
      // validation and default values are handled in the child
      // component itself.
      var propOptions = Ctor.options.props;
      if (!propOptions) {
        return
      }
      var res = {};
      var attrs = data.attrs;
      var props = data.props;
      var domProps = data.domProps;
      if (attrs || props || domProps) {
        for (var key in propOptions) {
          var altKey = hyphenate(key);
          checkProp(res, props, key, altKey, true) ||
            checkProp(res, attrs, key, altKey) ||
            checkProp(res, domProps, key, altKey);
        }
      }
      return res
    }

    function checkProp(
      res,
      hash,
      key,
      altKey,
      preserve
    ) {
      if (hash) {
        if (hasOwn(hash, key)) {
          res[key] = hash[key];
          if (!preserve) {
            delete hash[key];
          }
          return true
        } else if (hasOwn(hash, altKey)) {
          res[key] = hash[altKey];
          if (!preserve) {
            delete hash[altKey];
          }
          return true
        }
      }
      return false
    }

    function mergeHooks(data) {
      if (!data.hook) {
        data.hook = {};
      }
      for (var i = 0; i < hooksToMerge.length; i++) {
        var key = hooksToMerge[i];
        var fromParent = data.hook[key];
        var ours = hooks[key];
        data.hook[key] = fromParent ? mergeHook$1(ours, fromParent) : ours;
      }
    }

    function mergeHook$1(one, two) {
      return function (a, b, c, d) {
        one(a, b, c, d);
        two(a, b, c, d);
      }
    }

    /*  */

    function mergeVNodeHook(def, hookKey, hook, key) {
      key = key + hookKey;
      var injectedHash = def.__injected || (def.__injected = {});
      if (!injectedHash[key]) {
        injectedHash[key] = true;
        var oldHook = def[hookKey];
        if (oldHook) {
          def[hookKey] = function () {
            oldHook.apply(this, arguments);
            hook.apply(this, arguments);
          };
        } else {
          def[hookKey] = hook;
        }
      }
    }

    /*  */

    var normalizeEvent = cached(function (name) {
      var once = name.charAt(0) === '~'; // Prefixed last, checked first
      name = once ? name.slice(1) : name;
      var capture = name.charAt(0) === '!';
      name = capture ? name.slice(1) : name;
      return {
        name: name,
        once: once,
        capture: capture
      }
    });

    function createEventHandle(fn) {
      var handle = {
        fn: fn,
        invoker: function () {
          var arguments$1 = arguments;

          var fn = handle.fn;
          if (Array.isArray(fn)) {
            for (var i = 0; i < fn.length; i++) {
              fn[i].apply(null, arguments$1);
            }
          } else {
            fn.apply(null, arguments);
          }
        }
      };
      return handle
    }

    function updateListeners(
      on,
      oldOn,
      add,
      remove$$1,
      vm
    ) {
      var name, cur, old, event;
      for (name in on) {
        cur = on[name];
        old = oldOn[name];
        event = normalizeEvent(name);
        if (!cur) {
          "development" !== 'production' && warn(
            "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
            vm
          );
        } else if (!old) {
          if (!cur.invoker) {
            cur = on[name] = createEventHandle(cur);
          }
          add(event.name, cur.invoker, event.once, event.capture);
        } else if (cur !== old) {
          old.fn = cur;
          on[name] = old;
        }
      }
      for (name in oldOn) {
        if (!on[name]) {
          event = normalizeEvent(name);
          remove$$1(event.name, oldOn[name].invoker, event.capture);
        }
      }
    }

    /*  */

    // The template compiler attempts to minimize the need for normalization by
    // statically analyzing the template at compile time.
    //
    // For plain HTML markup, normalization can be completely skipped because the
    // generated render function is guaranteed to return Array<VNode>. There are
    // two cases where extra normalization is needed:

    // 1. When the children contains components - because a functional component
    // may return an Array instead of a single root. In this case, just a simple
    // nomralization is needed - if any child is an Array, we flatten the whole
    // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
    // because functional components already normalize their own children.
    function simpleNormalizeChildren(children) {
      for (var i = 0; i < children.length; i++) {
        if (Array.isArray(children[i])) {
          return Array.prototype.concat.apply([], children)
        }
      }
      return children
    }

    // 2. When the children contains constrcuts that always generated nested Arrays,
    // e.g. <template>, <slot>, v-for, or when the children is provided by user
    // with hand-written render functions / JSX. In such cases a full normalization
    // is needed to cater to all possible types of children values.
    function normalizeChildren(children) {
      return isPrimitive(children)
        ? [createTextVNode(children)]
        : Array.isArray(children)
          ? normalizeArrayChildren(children)
          : undefined
    }

    function normalizeArrayChildren(children, nestedIndex) {
      var res = [];
      var i, c, last;
      for (i = 0; i < children.length; i++) {
        c = children[i];
        if (c == null || typeof c === 'boolean') { continue }
        last = res[res.length - 1];
        //  nested
        if (Array.isArray(c)) {
          res.push.apply(res, normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i)));
        } else if (isPrimitive(c)) {
          if (last && last.text) {
            last.text += String(c);
          } else if (c !== '') {
            // convert primitive to vnode
            res.push(createTextVNode(c));
          }
        } else {
          if (c.text && last && last.text) {
            res[res.length - 1] = createTextVNode(last.text + c.text);
          } else {
            // default key for nested array children (likely generated by v-for)
            if (c.tag && c.key == null && nestedIndex != null) {
              c.key = "__vlist" + nestedIndex + "_" + i + "__";
            }
            res.push(c);
          }
        }
      }
      return res
    }

    /*  */

    function getFirstComponentChild(children) {
      return children && children.filter(function (c) { return c && c.componentOptions; })[0]
    }

    /*  */

    var SIMPLE_NORMALIZE = 1;
    var ALWAYS_NORMALIZE = 2;

    // wrapper function for providing a more flexible interface
    // without getting yelled at by flow
    function createElement(
      context,
      tag,
      data,
      children,
      normalizationType,
      alwaysNormalize
    ) {
      if (Array.isArray(data) || isPrimitive(data)) {
        normalizationType = children;
        children = data;
        data = undefined;
      }
      if (alwaysNormalize) { normalizationType = ALWAYS_NORMALIZE; }
      return _createElement(context, tag, data, children, normalizationType)
    }

    function _createElement(
      context,
      tag,
      data,
      children,
      normalizationType
    ) {
      if (data && data.__ob__) {
        "development" !== 'production' && warn(
          "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
          'Always create fresh vnode data objects in each render!',
          context
        );
        return createEmptyVNode()
      }
      if (!tag) {
        // in case of component :is set to falsy value
        return createEmptyVNode()
      }
      // support single function children as default scoped slot
      if (Array.isArray(children) &&
        typeof children[0] === 'function') {
        data = data || {};
        data.scopedSlots = { default: children[0] };
        children.length = 0;
      }
      if (normalizationType === ALWAYS_NORMALIZE) {
        children = normalizeChildren(children);
      } else if (normalizationType === SIMPLE_NORMALIZE) {
        children = simpleNormalizeChildren(children);
      }
      var vnode, ns;
      if (typeof tag === 'string') {
        var Ctor;
        ns = config.getTagNamespace(tag);
        if (config.isReservedTag(tag)) {
          // platform built-in elements
          vnode = new VNode(
            config.parsePlatformTagName(tag), data, children,
            undefined, undefined, context
          );
        } else if ((Ctor = resolveAsset(context.$options, 'components', tag))) {
          // component
          vnode = createComponent(Ctor, data, context, children, tag);
        } else {
          // unknown or unlisted namespaced elements
          // check at runtime because it may get assigned a namespace when its
          // parent normalizes children
          vnode = new VNode(
            tag, data, children,
            undefined, undefined, context
          );
        }
      } else {
        // direct component options / constructor
        vnode = createComponent(tag, data, context, children);
      }
      if (vnode) {
        if (ns) { applyNS(vnode, ns); }
        return vnode
      } else {
        return createEmptyVNode()
      }
    }

    function applyNS(vnode, ns) {
      vnode.ns = ns;
      if (vnode.tag === 'foreignObject') {
        // use default namespace inside foreignObject
        return
      }
      if (vnode.children) {
        for (var i = 0, l = vnode.children.length; i < l; i++) {
          var child = vnode.children[i];
          if (child.tag && !child.ns) {
            applyNS(child, ns);
          }
        }
      }
    }

    /*  */

    function initRender(vm) {
      vm.$vnode = null; // the placeholder node in parent tree
      vm._vnode = null; // the root of the child tree
      vm._staticTrees = null;
      var parentVnode = vm.$options._parentVnode;
      var renderContext = parentVnode && parentVnode.context;
      vm.$slots = resolveSlots(vm.$options._renderChildren, renderContext);
      vm.$scopedSlots = {};
      // bind the createElement fn to this instance
      // so that we get proper render context inside it.
      // args order: tag, data, children, normalizationType, alwaysNormalize
      // internal version is used by render functions compiled from templates
      vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
      // normalization is always applied for the public version, used in
      // user-written render functions.
      vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
    }

    function renderMixin(Vue) {
      Vue.prototype.$nextTick = function (fn) {
        return nextTick(fn, this)
      };

      Vue.prototype._render = function () {
        var vm = this;
        var ref = vm.$options;
        var render = ref.render;
        var staticRenderFns = ref.staticRenderFns;
        var _parentVnode = ref._parentVnode;

        if (vm._isMounted) {
          // clone slot nodes on re-renders
          for (var key in vm.$slots) {
            vm.$slots[key] = cloneVNodes(vm.$slots[key]);
          }
        }

        if (_parentVnode && _parentVnode.data.scopedSlots) {
          vm.$scopedSlots = _parentVnode.data.scopedSlots;
        }

        if (staticRenderFns && !vm._staticTrees) {
          vm._staticTrees = [];
        }
        // set parent vnode. this allows render functions to have access
        // to the data on the placeholder node.
        vm.$vnode = _parentVnode;
        // render self
        var vnode;
        try {
          vnode = render.call(vm._renderProxy, vm.$createElement);
        } catch (e) {
          /* istanbul ignore else */
          if (config.errorHandler) {
            config.errorHandler.call(null, e, vm);
          } else {
            {
              warn(("Error when rendering " + (formatComponentName(vm)) + ":"));
            }
            throw e
          }
          // return previous vnode to prevent render error causing blank component
          vnode = vm._vnode;
        }
        // return empty vnode in case the render function errored out
        if (!(vnode instanceof VNode)) {
          if ("development" !== 'production' && Array.isArray(vnode)) {
            warn(
              'Multiple root nodes returned from render function. Render function ' +
              'should return a single root node.',
              vm
            );
          }
          vnode = createEmptyVNode();
        }
        // set parent
        vnode.parent = _parentVnode;
        return vnode
      };

      // toString for mustaches
      Vue.prototype._s = _toString;
      // convert text to vnode
      Vue.prototype._v = createTextVNode;
      // number conversion
      Vue.prototype._n = toNumber;
      // empty vnode
      Vue.prototype._e = createEmptyVNode;
      // loose equal
      Vue.prototype._q = looseEqual;
      // loose indexOf
      Vue.prototype._i = looseIndexOf;

      // render static tree by index
      Vue.prototype._m = function renderStatic(
        index,
        isInFor
      ) {
        var tree = this._staticTrees[index];
        // if has already-rendered static tree and not inside v-for,
        // we can reuse the same tree by doing a shallow clone.
        if (tree && !isInFor) {
          return Array.isArray(tree)
            ? cloneVNodes(tree)
            : cloneVNode(tree)
        }
        // otherwise, render a fresh tree.
        tree = this._staticTrees[index] = this.$options.staticRenderFns[index].call(this._renderProxy);
        markStatic(tree, ("__static__" + index), false);
        return tree
      };

      // mark node as static (v-once)
      Vue.prototype._o = function markOnce(
        tree,
        index,
        key
      ) {
        markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
        return tree
      };

      function markStatic(tree, key, isOnce) {
        if (Array.isArray(tree)) {
          for (var i = 0; i < tree.length; i++) {
            if (tree[i] && typeof tree[i] !== 'string') {
              markStaticNode(tree[i], (key + "_" + i), isOnce);
            }
          }
        } else {
          markStaticNode(tree, key, isOnce);
        }
      }

      function markStaticNode(node, key, isOnce) {
        node.isStatic = true;
        node.key = key;
        node.isOnce = isOnce;
      }

      // filter resolution helper
      Vue.prototype._f = function resolveFilter(id) {
        return resolveAsset(this.$options, 'filters', id, true) || identity
      };

      // render v-for
      Vue.prototype._l = function renderList(
        val,
        render
      ) {
        var ret, i, l, keys, key;
        if (Array.isArray(val) || typeof val === 'string') {
          ret = new Array(val.length);
          for (i = 0, l = val.length; i < l; i++) {
            ret[i] = render(val[i], i);
          }
        } else if (typeof val === 'number') {
          ret = new Array(val);
          for (i = 0; i < val; i++) {
            ret[i] = render(i + 1, i);
          }
        } else if (isObject(val)) {
          keys = Object.keys(val);
          ret = new Array(keys.length);
          for (i = 0, l = keys.length; i < l; i++) {
            key = keys[i];
            ret[i] = render(val[key], key, i);
          }
        }
        return ret
      };

      // renderSlot
      Vue.prototype._t = function (
        name,
        fallback,
        props,
        bindObject
      ) {
        var scopedSlotFn = this.$scopedSlots[name];
        if (scopedSlotFn) { // scoped slot
          props = props || {};
          if (bindObject) {
            extend(props, bindObject);
          }
          return scopedSlotFn(props) || fallback
        } else {
          var slotNodes = this.$slots[name];
          // warn duplicate slot usage
          if (slotNodes && "development" !== 'production') {
            slotNodes._rendered && warn(
              "Duplicate presence of slot \"" + name + "\" found in the same render tree " +
              "- this will likely cause render errors.",
              this
            );
            slotNodes._rendered = true;
          }
          return slotNodes || fallback
        }
      };

      // apply v-bind object
      Vue.prototype._b = function bindProps(
        data,
        tag,
        value,
        asProp
      ) {
        if (value) {
          if (!isObject(value)) {
            "development" !== 'production' && warn(
              'v-bind without argument expects an Object or Array value',
              this
            );
          } else {
            if (Array.isArray(value)) {
              value = toObject(value);
            }
            for (var key in value) {
              if (key === 'class' || key === 'style') {
                data[key] = value[key];
              } else {
                var type = data.attrs && data.attrs.type;
                var hash = asProp || config.mustUseProp(tag, type, key)
                  ? data.domProps || (data.domProps = {})
                  : data.attrs || (data.attrs = {});
                hash[key] = value[key];
              }
            }
          }
        }
        return data
      };

      // check v-on keyCodes
      Vue.prototype._k = function checkKeyCodes(
        eventKeyCode,
        key,
        builtInAlias
      ) {
        var keyCodes = config.keyCodes[key] || builtInAlias;
        if (Array.isArray(keyCodes)) {
          return keyCodes.indexOf(eventKeyCode) === -1
        } else {
          return keyCodes !== eventKeyCode
        }
      };
    }

    function resolveSlots(
      children,
      context
    ) {
      var slots = {};
      if (!children) {
        return slots
      }
      var defaultSlot = [];
      var name, child;
      for (var i = 0, l = children.length; i < l; i++) {
        child = children[i];
        // named slots should only be respected if the vnode was rendered in the
        // same context.
        if ((child.context === context || child.functionalContext === context) &&
          child.data && (name = child.data.slot)) {
          var slot = (slots[name] || (slots[name] = []));
          if (child.tag === 'template') {
            slot.push.apply(slot, child.children);
          } else {
            slot.push(child);
          }
        } else {
          defaultSlot.push(child);
        }
      }
      // ignore single whitespace
      if (defaultSlot.length && !(
        defaultSlot.length === 1 &&
        (defaultSlot[0].text === ' ' || defaultSlot[0].isComment)
      )) {
        slots.default = defaultSlot;
      }
      return slots
    }

    /*  */

    function initEvents(vm) {
      vm._events = Object.create(null);
      vm._hasHookEvent = false;
      // init parent attached events
      var listeners = vm.$options._parentListeners;
      if (listeners) {
        updateComponentListeners(vm, listeners);
      }
    }

    var target;

    function add$1(event, fn, once) {
      if (once) {
        target.$once(event, fn);
      } else {
        target.$on(event, fn);
      }
    }

    function remove$2(event, fn) {
      target.$off(event, fn);
    }

    function updateComponentListeners(
      vm,
      listeners,
      oldListeners
    ) {
      target = vm;
      updateListeners(listeners, oldListeners || {}, add$1, remove$2, vm);
    }

    function eventsMixin(Vue) {
      var hookRE = /^hook:/;
      Vue.prototype.$on = function (event, fn) {
        var vm = this; (vm._events[event] || (vm._events[event] = [])).push(fn);
        // optimize hook:event cost by using a boolean flag marked at registration
        // instead of a hash lookup
        if (hookRE.test(event)) {
          vm._hasHookEvent = true;
        }
        return vm
      };

      Vue.prototype.$once = function (event, fn) {
        var vm = this;
        function on() {
          vm.$off(event, on);
          fn.apply(vm, arguments);
        }
        on.fn = fn;
        vm.$on(event, on);
        return vm
      };

      Vue.prototype.$off = function (event, fn) {
        var vm = this;
        // all
        if (!arguments.length) {
          vm._events = Object.create(null);
          return vm
        }
        // specific event
        var cbs = vm._events[event];
        if (!cbs) {
          return vm
        }
        if (arguments.length === 1) {
          vm._events[event] = null;
          return vm
        }
        // specific handler
        var cb;
        var i = cbs.length;
        while (i--) {
          cb = cbs[i];
          if (cb === fn || cb.fn === fn) {
            cbs.splice(i, 1);
            break
          }
        }
        return vm
      };

      Vue.prototype.$emit = function (event) {
        var vm = this;
        var cbs = vm._events[event];
        if (cbs) {
          cbs = cbs.length > 1 ? toArray(cbs) : cbs;
          var args = toArray(arguments, 1);
          for (var i = 0, l = cbs.length; i < l; i++) {
            cbs[i].apply(vm, args);
          }
        }
        return vm
      };
    }

    /*  */

    var activeInstance = null;

    function initLifecycle(vm) {
      var options = vm.$options;

      // locate first non-abstract parent
      var parent = options.parent;
      if (parent && !options.abstract) {
        while (parent.$options.abstract && parent.$parent) {
          parent = parent.$parent;
        }
        parent.$children.push(vm);
      }

      vm.$parent = parent;
      vm.$root = parent ? parent.$root : vm;

      vm.$children = [];
      vm.$refs = {};

      vm._watcher = null;
      vm._inactive = false;
      vm._isMounted = false;
      vm._isDestroyed = false;
      vm._isBeingDestroyed = false;
    }

    function lifecycleMixin(Vue) {
      Vue.prototype._mount = function (
        el,
        hydrating
      ) {
        var vm = this;
        vm.$el = el;
        if (!vm.$options.render) {
          vm.$options.render = createEmptyVNode;
          {
            /* istanbul ignore if */
            if (vm.$options.template && vm.$options.template.charAt(0) !== '#') {
              warn(
                'You are using the runtime-only build of Vue where the template ' +
                'option is not available. Either pre-compile the templates into ' +
                'render functions, or use the compiler-included build.',
                vm
              );
            } else {
              warn(
                'Failed to mount component: template or render function not defined.',
                vm
              );
            }
          }
        }
        callHook(vm, 'beforeMount');
        vm._watcher = new Watcher(vm, function updateComponent() {
          vm._update(vm._render(), hydrating);
        }, noop);
        hydrating = false;
        // manually mounted instance, call mounted on self
        // mounted is called for render-created child components in its inserted hook
        if (vm.$vnode == null) {
          vm._isMounted = true;
          callHook(vm, 'mounted');
        }
        return vm
      };

      Vue.prototype._update = function (vnode, hydrating) {
        var vm = this;
        if (vm._isMounted) {
          callHook(vm, 'beforeUpdate');
        }
        var prevEl = vm.$el;
        var prevVnode = vm._vnode;
        var prevActiveInstance = activeInstance;
        activeInstance = vm;
        vm._vnode = vnode;
        // Vue.prototype.__patch__ is injected in entry points
        // based on the rendering backend used.
        if (!prevVnode) {
          // initial render
          vm.$el = vm.__patch__(
            vm.$el, vnode, hydrating, false /* removeOnly */,
            vm.$options._parentElm,
            vm.$options._refElm
          );
        } else {
          // updates
          vm.$el = vm.__patch__(prevVnode, vnode);
        }
        activeInstance = prevActiveInstance;
        // update __vue__ reference
        if (prevEl) {
          prevEl.__vue__ = null;
        }
        if (vm.$el) {
          vm.$el.__vue__ = vm;
        }
        // if parent is an HOC, update its $el as well
        if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
          vm.$parent.$el = vm.$el;
        }
        // updated hook is called by the scheduler to ensure that children are
        // updated in a parent's updated hook.
      };

      Vue.prototype._updateFromParent = function (
        propsData,
        listeners,
        parentVnode,
        renderChildren
      ) {
        var vm = this;
        var hasChildren = !!(vm.$options._renderChildren || renderChildren);
        vm.$options._parentVnode = parentVnode;
        vm.$vnode = parentVnode; // update vm's placeholder node without re-render
        if (vm._vnode) { // update child tree's parent
          vm._vnode.parent = parentVnode;
        }
        vm.$options._renderChildren = renderChildren;
        // update props
        if (propsData && vm.$options.props) {
          observerState.shouldConvert = false;
          {
            observerState.isSettingProps = true;
          }
          var propKeys = vm.$options._propKeys || [];
          for (var i = 0; i < propKeys.length; i++) {
            var key = propKeys[i];
            vm[key] = validateProp(key, vm.$options.props, propsData, vm);
          }
          observerState.shouldConvert = true;
          {
            observerState.isSettingProps = false;
          }
          vm.$options.propsData = propsData;
        }
        // update listeners
        if (listeners) {
          var oldListeners = vm.$options._parentListeners;
          vm.$options._parentListeners = listeners;
          updateComponentListeners(vm, listeners, oldListeners);
        }
        // resolve slots + force update if has children
        if (hasChildren) {
          vm.$slots = resolveSlots(renderChildren, parentVnode.context);
          vm.$forceUpdate();
        }
      };

      Vue.prototype.$forceUpdate = function () {
        var vm = this;
        if (vm._watcher) {
          vm._watcher.update();
        }
      };

      Vue.prototype.$destroy = function () {
        var vm = this;
        if (vm._isBeingDestroyed) {
          return
        }
        callHook(vm, 'beforeDestroy');
        vm._isBeingDestroyed = true;
        // remove self from parent
        var parent = vm.$parent;
        if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
          remove$1(parent.$children, vm);
        }
        // teardown watchers
        if (vm._watcher) {
          vm._watcher.teardown();
        }
        var i = vm._watchers.length;
        while (i--) {
          vm._watchers[i].teardown();
        }
        // remove reference from data ob
        // frozen object may not have observer.
        if (vm._data.__ob__) {
          vm._data.__ob__.vmCount--;
        }
        // call the last hook...
        vm._isDestroyed = true;
        callHook(vm, 'destroyed');
        // turn off all instance listeners.
        vm.$off();
        // remove __vue__ reference
        if (vm.$el) {
          vm.$el.__vue__ = null;
        }
        // invoke destroy hooks on current rendered tree
        vm.__patch__(vm._vnode, null);
      };
    }

    function callHook(vm, hook) {
      var handlers = vm.$options[hook];
      if (handlers) {
        for (var i = 0, j = handlers.length; i < j; i++) {
          handlers[i].call(vm);
        }
      }
      if (vm._hasHookEvent) {
        vm.$emit('hook:' + hook);
      }
    }

    /*  */


    var queue = [];
    var has$1 = {};
    var circular = {};
    var waiting = false;
    var flushing = false;
    var index = 0;

    /**
     * Reset the scheduler's state.
     */
    function resetSchedulerState() {
      queue.length = 0;
      has$1 = {};
      {
        circular = {};
      }
      waiting = flushing = false;
    }

    /**
     * Flush both queues and run the watchers.
     */
    function flushSchedulerQueue() {
      flushing = true;
      var watcher, id, vm;

      // Sort queue before flush.
      // This ensures that:
      // 1. Components are updated from parent to child. (because parent is always
      //    created before the child)
      // 2. A component's user watchers are run before its render watcher (because
      //    user watchers are created before the render watcher)
      // 3. If a component is destroyed during a parent component's watcher run,
      //    its watchers can be skipped.
      queue.sort(function (a, b) { return a.id - b.id; });

      // do not cache length because more watchers might be pushed
      // as we run existing watchers
      for (index = 0; index < queue.length; index++) {
        watcher = queue[index];
        id = watcher.id;
        has$1[id] = null;
        watcher.run();
        // in dev build, check and stop circular updates.
        if ("development" !== 'production' && has$1[id] != null) {
          circular[id] = (circular[id] || 0) + 1;
          if (circular[id] > config._maxUpdateCount) {
            warn(
              'You may have an infinite update loop ' + (
                watcher.user
                  ? ("in watcher with expression \"" + (watcher.expression) + "\"")
                  : "in a component render function."
              ),
              watcher.vm
            );
            break
          }
        }
      }

      // call updated hooks
      index = queue.length;
      while (index--) {
        watcher = queue[index];
        vm = watcher.vm;
        if (vm._watcher === watcher && vm._isMounted) {
          callHook(vm, 'updated');
        }
      }

      // devtool hook
      /* istanbul ignore if */
      if (devtools && config.devtools) {
        devtools.emit('flush');
      }

      resetSchedulerState();
    }

    /**
     * Push a watcher into the watcher queue.
     * Jobs with duplicate IDs will be skipped unless it's
     * pushed when the queue is being flushed.
     */
    function queueWatcher(watcher) {
      var id = watcher.id;
      if (has$1[id] == null) {
        has$1[id] = true;
        if (!flushing) {
          queue.push(watcher);
        } else {
          // if already flushing, splice the watcher based on its id
          // if already past its id, it will be run next immediately.
          var i = queue.length - 1;
          while (i >= 0 && queue[i].id > watcher.id) {
            i--;
          }
          queue.splice(Math.max(i, index) + 1, 0, watcher);
        }
        // queue the flush
        if (!waiting) {
          waiting = true;
          nextTick(flushSchedulerQueue);
        }
      }
    }

    /*  */

    var uid$2 = 0;

    /**
     * A watcher parses an expression, collects dependencies,
     * and fires callback when the expression value changes.
     * This is used for both the $watch() api and directives.
     */
    var Watcher = function Watcher(
      vm,
      expOrFn,
      cb,
      options
    ) {
      this.vm = vm;
      vm._watchers.push(this);
      // options
      if (options) {
        this.deep = !!options.deep;
        this.user = !!options.user;
        this.lazy = !!options.lazy;
        this.sync = !!options.sync;
      } else {
        this.deep = this.user = this.lazy = this.sync = false;
      }
      this.cb = cb;
      this.id = ++uid$2; // uid for batching
      this.active = true;
      this.dirty = this.lazy; // for lazy watchers
      this.deps = [];
      this.newDeps = [];
      this.depIds = new _Set();
      this.newDepIds = new _Set();
      this.expression = expOrFn.toString();
      // parse expression for getter
      if (typeof expOrFn === 'function') {
        this.getter = expOrFn;
      } else {
        this.getter = parsePath(expOrFn);
        if (!this.getter) {
          this.getter = function () { };
          "development" !== 'production' && warn(
            "Failed watching path: \"" + expOrFn + "\" " +
            'Watcher only accepts simple dot-delimited paths. ' +
            'For full control, use a function instead.',
            vm
          );
        }
      }
      this.value = this.lazy
        ? undefined
        : this.get();
    };

    /**
     * Evaluate the getter, and re-collect dependencies.
     */
    Watcher.prototype.get = function get() {
      pushTarget(this);
      var value = this.getter.call(this.vm, this.vm);
      // "touch" every property so they are all tracked as
      // dependencies for deep watching
      if (this.deep) {
        traverse(value);
      }
      popTarget();
      this.cleanupDeps();
      return value
    };

    /**
     * Add a dependency to this directive.
     */
    Watcher.prototype.addDep = function addDep(dep) {
      var id = dep.id;
      if (!this.newDepIds.has(id)) {
        this.newDepIds.add(id);
        this.newDeps.push(dep);
        if (!this.depIds.has(id)) {
          dep.addSub(this);
        }
      }
    };

    /**
     * Clean up for dependency collection.
     */
    Watcher.prototype.cleanupDeps = function cleanupDeps() {
      var this$1 = this;

      var i = this.deps.length;
      while (i--) {
        var dep = this$1.deps[i];
        if (!this$1.newDepIds.has(dep.id)) {
          dep.removeSub(this$1);
        }
      }
      var tmp = this.depIds;
      this.depIds = this.newDepIds;
      this.newDepIds = tmp;
      this.newDepIds.clear();
      tmp = this.deps;
      this.deps = this.newDeps;
      this.newDeps = tmp;
      this.newDeps.length = 0;
    };

    /**
     * Subscriber interface.
     * Will be called when a dependency changes.
     */
    Watcher.prototype.update = function update() {
      /* istanbul ignore else */
      if (this.lazy) {
        this.dirty = true;
      } else if (this.sync) {
        this.run();
      } else {
        queueWatcher(this);
      }
    };

    /**
     * Scheduler job interface.
     * Will be called by the scheduler.
     */
    Watcher.prototype.run = function run() {
      if (this.active) {
        var value = this.get();
        if (
          value !== this.value ||
          // Deep watchers and watchers on Object/Arrays should fire even
          // when the value is the same, because the value may
          // have mutated.
          isObject(value) ||
          this.deep
        ) {
          // set new value
          var oldValue = this.value;
          this.value = value;
          if (this.user) {
            try {
              this.cb.call(this.vm, value, oldValue);
            } catch (e) {
              /* istanbul ignore else */
              if (config.errorHandler) {
                config.errorHandler.call(null, e, this.vm);
              } else {
                "development" !== 'production' && warn(
                  ("Error in watcher \"" + (this.expression) + "\""),
                  this.vm
                );
                throw e
              }
            }
          } else {
            this.cb.call(this.vm, value, oldValue);
          }
        }
      }
    };

    /**
     * Evaluate the value of the watcher.
     * This only gets called for lazy watchers.
     */
    Watcher.prototype.evaluate = function evaluate() {
      this.value = this.get();
      this.dirty = false;
    };

    /**
     * Depend on all deps collected by this watcher.
     */
    Watcher.prototype.depend = function depend() {
      var this$1 = this;

      var i = this.deps.length;
      while (i--) {
        this$1.deps[i].depend();
      }
    };

    /**
     * Remove self from all dependencies' subscriber list.
     */
    Watcher.prototype.teardown = function teardown() {
      var this$1 = this;

      if (this.active) {
        // remove self from vm's watcher list
        // this is a somewhat expensive operation so we skip it
        // if the vm is being destroyed.
        if (!this.vm._isBeingDestroyed) {
          remove$1(this.vm._watchers, this);
        }
        var i = this.deps.length;
        while (i--) {
          this$1.deps[i].removeSub(this$1);
        }
        this.active = false;
      }
    };

    /**
     * Recursively traverse an object to evoke all converted
     * getters, so that every nested property inside the object
     * is collected as a "deep" dependency.
     */
    var seenObjects = new _Set();
    function traverse(val) {
      seenObjects.clear();
      _traverse(val, seenObjects);
    }

    function _traverse(val, seen) {
      var i, keys;
      var isA = Array.isArray(val);
      if ((!isA && !isObject(val)) || !Object.isExtensible(val)) {
        return
      }
      if (val.__ob__) {
        var depId = val.__ob__.dep.id;
        if (seen.has(depId)) {
          return
        }
        seen.add(depId);
      }
      if (isA) {
        i = val.length;
        while (i--) { _traverse(val[i], seen); }
      } else {
        keys = Object.keys(val);
        i = keys.length;
        while (i--) { _traverse(val[keys[i]], seen); }
      }
    }

    /*  */

    function initState(vm) {
      vm._watchers = [];
      var opts = vm.$options;
      if (opts.props) { initProps(vm, opts.props); }
      if (opts.methods) { initMethods(vm, opts.methods); }
      if (opts.data) {
        initData(vm);
      } else {
        observe(vm._data = {}, true /* asRootData */);
      }
      if (opts.computed) { initComputed(vm, opts.computed); }
      if (opts.watch) { initWatch(vm, opts.watch); }
    }

    var isReservedProp = { key: 1, ref: 1, slot: 1 };

    function initProps(vm, props) {
      var propsData = vm.$options.propsData || {};
      var keys = vm.$options._propKeys = Object.keys(props);
      var isRoot = !vm.$parent;
      // root instance props should be converted
      observerState.shouldConvert = isRoot;
      var loop = function (i) {
        var key = keys[i];
        /* istanbul ignore else */
        {
          if (isReservedProp[key]) {
            warn(
              ("\"" + key + "\" is a reserved attribute and cannot be used as component prop."),
              vm
            );
          }
          defineReactive$$1(vm, key, validateProp(key, props, propsData, vm), function () {
            if (vm.$parent && !observerState.isSettingProps) {
              warn(
                "Avoid mutating a prop directly since the value will be " +
                "overwritten whenever the parent component re-renders. " +
                "Instead, use a data or computed property based on the prop's " +
                "value. Prop being mutated: \"" + key + "\"",
                vm
              );
            }
          });
        }
      };

      for (var i = 0; i < keys.length; i++) loop(i);
      observerState.shouldConvert = true;
    }

    function initData(vm) {
      var data = vm.$options.data;
      data = vm._data = typeof data === 'function'
        ? data.call(vm)
        : data || {};
      if (!isPlainObject(data)) {
        data = {};
        "development" !== 'production' && warn(
          'data functions should return an object:\n' +
          'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
          vm
        );
      }
      // proxy data on instance
      var keys = Object.keys(data);
      var props = vm.$options.props;
      var i = keys.length;
      while (i--) {
        if (props && hasOwn(props, keys[i])) {
          "development" !== 'production' && warn(
            "The data property \"" + (keys[i]) + "\" is already declared as a prop. " +
            "Use prop default value instead.",
            vm
          );
        } else {
          proxy(vm, keys[i]);
        }
      }
      // observe data
      observe(data, true /* asRootData */);
    }

    var computedSharedDefinition = {
      enumerable: true,
      configurable: true,
      get: noop,
      set: noop
    };

    function initComputed(vm, computed) {
      for (var key in computed) {
        /* istanbul ignore if */
        if ("development" !== 'production' && key in vm) {
          warn(
            "existing instance property \"" + key + "\" will be " +
            "overwritten by a computed property with the same name.",
            vm
          );
        }
        var userDef = computed[key];
        if (typeof userDef === 'function') {
          computedSharedDefinition.get = makeComputedGetter(userDef, vm);
          computedSharedDefinition.set = noop;
        } else {
          computedSharedDefinition.get = userDef.get
            ? userDef.cache !== false
              ? makeComputedGetter(userDef.get, vm)
              : bind$1(userDef.get, vm)
            : noop;
          computedSharedDefinition.set = userDef.set
            ? bind$1(userDef.set, vm)
            : noop;
        }
        Object.defineProperty(vm, key, computedSharedDefinition);
      }
    }

    function makeComputedGetter(getter, owner) {
      var watcher = new Watcher(owner, getter, noop, {
        lazy: true
      });
      return function computedGetter() {
        if (watcher.dirty) {
          watcher.evaluate();
        }
        if (Dep.target) {
          watcher.depend();
        }
        return watcher.value
      }
    }

    function initMethods(vm, methods) {
      for (var key in methods) {
        vm[key] = methods[key] == null ? noop : bind$1(methods[key], vm);
        if ("development" !== 'production' && methods[key] == null) {
          warn(
            "method \"" + key + "\" has an undefined value in the component definition. " +
            "Did you reference the function correctly?",
            vm
          );
        }
      }
    }

    function initWatch(vm, watch) {
      for (var key in watch) {
        var handler = watch[key];
        if (Array.isArray(handler)) {
          for (var i = 0; i < handler.length; i++) {
            createWatcher(vm, key, handler[i]);
          }
        } else {
          createWatcher(vm, key, handler);
        }
      }
    }

    function createWatcher(vm, key, handler) {
      var options;
      if (isPlainObject(handler)) {
        options = handler;
        handler = handler.handler;
      }
      if (typeof handler === 'string') {
        handler = vm[handler];
      }
      vm.$watch(key, handler, options);
    }

    function stateMixin(Vue) {
      // flow somehow has problems with directly declared definition object
      // when using Object.defineProperty, so we have to procedurally build up
      // the object here.
      var dataDef = {};
      dataDef.get = function () {
        return this._data
      };
      {
        dataDef.set = function (newData) {
          warn(
            'Avoid replacing instance root $data. ' +
            'Use nested data properties instead.',
            this
          );
        };
      }
      Object.defineProperty(Vue.prototype, '$data', dataDef);

      Vue.prototype.$set = set$1;
      Vue.prototype.$delete = del;

      Vue.prototype.$watch = function (
        expOrFn,
        cb,
        options
      ) {
        var vm = this;
        options = options || {};
        options.user = true;
        var watcher = new Watcher(vm, expOrFn, cb, options);
        if (options.immediate) {
          cb.call(vm, watcher.value);
        }
        return function unwatchFn() {
          watcher.teardown();
        }
      };
    }

    function proxy(vm, key) {
      if (!isReserved(key)) {
        Object.defineProperty(vm, key, {
          configurable: true,
          enumerable: true,
          get: function proxyGetter() {
            return vm._data[key]
          },
          set: function proxySetter(val) {
            vm._data[key] = val;
          }
        });
      }
    }

    /*  */

    var uid = 0;

    function initMixin(Vue) {
      Vue.prototype._init = function (options) {
        var vm = this;
        // a uid
        vm._uid = uid++;
        // a flag to avoid this being observed
        vm._isVue = true;
        // merge options
        if (options && options._isComponent) {
          // optimize internal component instantiation
          // since dynamic options merging is pretty slow, and none of the
          // internal component options needs special treatment.
          initInternalComponent(vm, options);
        } else {
          vm.$options = mergeOptions(
            resolveConstructorOptions(vm.constructor),
            options || {},
            vm
          );
        }
        /* istanbul ignore else */
        {
          initProxy(vm);
        }
        // expose real self
        vm._self = vm;
        initLifecycle(vm);
        initEvents(vm);
        initRender(vm);
        callHook(vm, 'beforeCreate');
        initState(vm);
        callHook(vm, 'created');
        if (vm.$options.el) {
          vm.$mount(vm.$options.el);
        }
      };
    }

    function initInternalComponent(vm, options) {
      var opts = vm.$options = Object.create(vm.constructor.options);
      // doing this because it's faster than dynamic enumeration.
      opts.parent = options.parent;
      opts.propsData = options.propsData;
      opts._parentVnode = options._parentVnode;
      opts._parentListeners = options._parentListeners;
      opts._renderChildren = options._renderChildren;
      opts._componentTag = options._componentTag;
      opts._parentElm = options._parentElm;
      opts._refElm = options._refElm;
      if (options.render) {
        opts.render = options.render;
        opts.staticRenderFns = options.staticRenderFns;
      }
    }

    function resolveConstructorOptions(Ctor) {
      var options = Ctor.options;
      if (Ctor.super) {
        var superOptions = Ctor.super.options;
        var cachedSuperOptions = Ctor.superOptions;
        var extendOptions = Ctor.extendOptions;
        if (superOptions !== cachedSuperOptions) {
          // super option changed
          Ctor.superOptions = superOptions;
          extendOptions.render = options.render;
          extendOptions.staticRenderFns = options.staticRenderFns;
          extendOptions._scopeId = options._scopeId;
          options = Ctor.options = mergeOptions(superOptions, extendOptions);
          if (options.name) {
            options.components[options.name] = Ctor;
          }
        }
      }
      return options
    }

    function Vue$3(options) {
      if ("development" !== 'production' &&
        !(this instanceof Vue$3)) {
        warn('Vue is a constructor and should be called with the `new` keyword');
      }
      this._init(options);
    }

    initMixin(Vue$3);
    stateMixin(Vue$3);
    eventsMixin(Vue$3);
    lifecycleMixin(Vue$3);
    renderMixin(Vue$3);

    /*  */

    function initUse(Vue) {
      Vue.use = function (plugin) {
        /* istanbul ignore if */
        if (plugin.installed) {
          return
        }
        // additional parameters
        var args = toArray(arguments, 1);
        args.unshift(this);
        if (typeof plugin.install === 'function') {
          plugin.install.apply(plugin, args);
        } else {
          plugin.apply(null, args);
        }
        plugin.installed = true;
        return this
      };
    }

    /*  */

    function initMixin$1(Vue) {
      Vue.mixin = function (mixin) {
        this.options = mergeOptions(this.options, mixin);
      };
    }

    /*  */

    function initExtend(Vue) {
      /**
       * Each instance constructor, including Vue, has a unique
       * cid. This enables us to create wrapped "child
       * constructors" for prototypal inheritance and cache them.
       */
      Vue.cid = 0;
      var cid = 1;

      /**
       * Class inheritance
       */
      Vue.extend = function (extendOptions) {
        extendOptions = extendOptions || {};
        var Super = this;
        var SuperId = Super.cid;
        var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
        if (cachedCtors[SuperId]) {
          return cachedCtors[SuperId]
        }
        var name = extendOptions.name || Super.options.name;
        {
          if (!/^[a-zA-Z][\w-]*$/.test(name)) {
            warn(
              'Invalid component name: "' + name + '". Component names ' +
              'can only contain alphanumeric characters and the hyphen, ' +
              'and must start with a letter.'
            );
          }
        }
        var Sub = function VueComponent(options) {
          this._init(options);
        };
        Sub.prototype = Object.create(Super.prototype);
        Sub.prototype.constructor = Sub;
        Sub.cid = cid++;
        Sub.options = mergeOptions(
          Super.options,
          extendOptions
        );
        Sub['super'] = Super;
        // allow further extension/mixin/plugin usage
        Sub.extend = Super.extend;
        Sub.mixin = Super.mixin;
        Sub.use = Super.use;
        // create asset registers, so extended classes
        // can have their private assets too.
        config._assetTypes.forEach(function (type) {
          Sub[type] = Super[type];
        });
        // enable recursive self-lookup
        if (name) {
          Sub.options.components[name] = Sub;
        }
        // keep a reference to the super options at extension time.
        // later at instantiation we can check if Super's options have
        // been updated.
        Sub.superOptions = Super.options;
        Sub.extendOptions = extendOptions;
        // cache constructor
        cachedCtors[SuperId] = Sub;
        return Sub
      };
    }

    /*  */

    function initAssetRegisters(Vue) {
      /**
       * Create asset registration methods.
       */
      config._assetTypes.forEach(function (type) {
        Vue[type] = function (
          id,
          definition
        ) {
          if (!definition) {
            return this.options[type + 's'][id]
          } else {
            /* istanbul ignore if */
            {
              if (type === 'component' && config.isReservedTag(id)) {
                warn(
                  'Do not use built-in or reserved HTML elements as component ' +
                  'id: ' + id
                );
              }
            }
            if (type === 'component' && isPlainObject(definition)) {
              definition.name = definition.name || id;
              definition = this.options._base.extend(definition);
            }
            if (type === 'directive' && typeof definition === 'function') {
              definition = { bind: definition, update: definition };
            }
            this.options[type + 's'][id] = definition;
            return definition
          }
        };
      });
    }

    /*  */

    var patternTypes = [String, RegExp];

    function getComponentName(opts) {
      return opts && (opts.Ctor.options.name || opts.tag)
    }

    function matches(pattern, name) {
      if (typeof pattern === 'string') {
        return pattern.split(',').indexOf(name) > -1
      } else {
        return pattern.test(name)
      }
    }

    function pruneCache(cache, filter) {
      for (var key in cache) {
        var cachedNode = cache[key];
        if (cachedNode) {
          var name = getComponentName(cachedNode.componentOptions);
          if (name && !filter(name)) {
            pruneCacheEntry(cachedNode);
            cache[key] = null;
          }
        }
      }
    }

    function pruneCacheEntry(vnode) {
      if (vnode) {
        if (!vnode.componentInstance._inactive) {
          callHook(vnode.componentInstance, 'deactivated');
        }
        vnode.componentInstance.$destroy();
      }
    }

    var KeepAlive = {
      name: 'keep-alive',
      abstract: true,

      props: {
        include: patternTypes,
        exclude: patternTypes
      },

      created: function created() {
        this.cache = Object.create(null);
      },

      destroyed: function destroyed() {
        var this$1 = this;

        for (var key in this.cache) {
          pruneCacheEntry(this$1.cache[key]);
        }
      },

      watch: {
        include: function include(val) {
          pruneCache(this.cache, function (name) { return matches(val, name); });
        },
        exclude: function exclude(val) {
          pruneCache(this.cache, function (name) { return !matches(val, name); });
        }
      },

      render: function render() {
        var vnode = getFirstComponentChild(this.$slots.default);
        var componentOptions = vnode && vnode.componentOptions;
        if (componentOptions) {
          // check pattern
          var name = getComponentName(componentOptions);
          if (name && (
            (this.include && !matches(this.include, name)) ||
            (this.exclude && matches(this.exclude, name))
          )) {
            return vnode
          }
          var key = vnode.key == null
            // same constructor may get registered as different local components
            // so cid alone is not enough (#3269)
            ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
            : vnode.key;
          if (this.cache[key]) {
            vnode.componentInstance = this.cache[key].componentInstance;
          } else {
            this.cache[key] = vnode;
          }
          vnode.data.keepAlive = true;
        }
        return vnode
      }
    };

    var builtInComponents = {
      KeepAlive: KeepAlive
    };

    /*  */

    function initGlobalAPI(Vue) {
      // config
      var configDef = {};
      configDef.get = function () { return config; };
      {
        configDef.set = function () {
          warn(
            'Do not replace the Vue.config object, set individual fields instead.'
          );
        };
      }
      Object.defineProperty(Vue, 'config', configDef);
      Vue.util = util;
      Vue.set = set$1;
      Vue.delete = del;
      Vue.nextTick = nextTick;

      Vue.options = Object.create(null);
      config._assetTypes.forEach(function (type) {
        Vue.options[type + 's'] = Object.create(null);
      });

      // this is used to identify the "base" constructor to extend all plain-object
      // components with in Weex's multi-instance scenarios.
      Vue.options._base = Vue;

      extend(Vue.options.components, builtInComponents);

      initUse(Vue);
      initMixin$1(Vue);
      initExtend(Vue);
      initAssetRegisters(Vue);
    }

    initGlobalAPI(Vue$3);

    Object.defineProperty(Vue$3.prototype, '$isServer', {
      get: isServerRendering
    });

    Vue$3.version = '2.1.10';

    /*  */

    // attributes that should be using props for binding
    var acceptValue = makeMap('input,textarea,option,select');
    var mustUseProp = function (tag, type, attr) {
      return (
        (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
        (attr === 'selected' && tag === 'option') ||
        (attr === 'checked' && tag === 'input') ||
        (attr === 'muted' && tag === 'video')
      )
    };

    var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');

    var isBooleanAttr = makeMap(
      'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
      'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
      'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
      'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
      'required,reversed,scoped,seamless,selected,sortable,translate,' +
      'truespeed,typemustmatch,visible'
    );

    var xlinkNS = 'http://www.w3.org/1999/xlink';

    var isXlink = function (name) {
      return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
    };

    var getXlinkProp = function (name) {
      return isXlink(name) ? name.slice(6, name.length) : ''
    };

    var isFalsyAttrValue = function (val) {
      return val == null || val === false
    };

    /*  */

    function genClassForVnode(vnode) {
      var data = vnode.data;
      var parentNode = vnode;
      var childNode = vnode;
      while (childNode.componentInstance) {
        childNode = childNode.componentInstance._vnode;
        if (childNode.data) {
          data = mergeClassData(childNode.data, data);
        }
      }
      while ((parentNode = parentNode.parent)) {
        if (parentNode.data) {
          data = mergeClassData(data, parentNode.data);
        }
      }
      return genClassFromData(data)
    }

    function mergeClassData(child, parent) {
      return {
        staticClass: concat(child.staticClass, parent.staticClass),
        class: child.class
          ? [child.class, parent.class]
          : parent.class
      }
    }

    function genClassFromData(data) {
      var dynamicClass = data.class;
      var staticClass = data.staticClass;
      if (staticClass || dynamicClass) {
        return concat(staticClass, stringifyClass(dynamicClass))
      }
      /* istanbul ignore next */
      return ''
    }

    function concat(a, b) {
      return a ? b ? (a + ' ' + b) : a : (b || '')
    }

    function stringifyClass(value) {
      var res = '';
      if (!value) {
        return res
      }
      if (typeof value === 'string') {
        return value
      }
      if (Array.isArray(value)) {
        var stringified;
        for (var i = 0, l = value.length; i < l; i++) {
          if (value[i]) {
            if ((stringified = stringifyClass(value[i]))) {
              res += stringified + ' ';
            }
          }
        }
        return res.slice(0, -1)
      }
      if (isObject(value)) {
        for (var key in value) {
          if (value[key]) { res += key + ' '; }
        }
        return res.slice(0, -1)
      }
      /* istanbul ignore next */
      return res
    }

    /*  */

    var namespaceMap = {
      svg: 'http://www.w3.org/2000/svg',
      math: 'http://www.w3.org/1998/Math/MathML'
    };

    var isHTMLTag = makeMap(
      'html,body,base,head,link,meta,style,title,' +
      'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
      'div,dd,dl,dt,figcaption,figure,hr,img,li,main,ol,p,pre,ul,' +
      'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
      's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
      'embed,object,param,source,canvas,script,noscript,del,ins,' +
      'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
      'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
      'output,progress,select,textarea,' +
      'details,dialog,menu,menuitem,summary,' +
      'content,element,shadow,template'
    );

    // this map is intentionally selective, only covering SVG elements that may
    // contain child elements.
    var isSVG = makeMap(
      'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,' +
      'font-face,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
      'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
      true
    );

    var isPreTag = function (tag) { return tag === 'pre'; };

    var isReservedTag = function (tag) {
      return isHTMLTag(tag) || isSVG(tag)
    };

    function getTagNamespace(tag) {
      if (isSVG(tag)) {
        return 'svg'
      }
      // basic support for MathML
      // note it doesn't support other MathML elements being component roots
      if (tag === 'math') {
        return 'math'
      }
    }

    var unknownElementCache = Object.create(null);
    function isUnknownElement(tag) {
      /* istanbul ignore if */
      if (!inBrowser) {
        return true
      }
      if (isReservedTag(tag)) {
        return false
      }
      tag = tag.toLowerCase();
      /* istanbul ignore if */
      if (unknownElementCache[tag] != null) {
        return unknownElementCache[tag]
      }
      var el = document.createElement(tag);
      if (tag.indexOf('-') > -1) {
        // http://stackoverflow.com/a/28210364/1070244
        return (unknownElementCache[tag] = (
          el.constructor === window.HTMLUnknownElement ||
          el.constructor === window.HTMLElement
        ))
      } else {
        return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
      }
    }

    /*  */

    /**
     * Query an element selector if it's not an element already.
     */
    function query(el) {
      if (typeof el === 'string') {
        var selector = el;
        el = document.querySelector(el);
        if (!el) {
          "development" !== 'production' && warn(
            'Cannot find element: ' + selector
          );
          return document.createElement('div')
        }
      }
      return el
    }

    /*  */

    function createElement$1(tagName, vnode) {
      var elm = document.createElement(tagName);
      if (tagName !== 'select') {
        return elm
      }
      if (vnode.data && vnode.data.attrs && 'multiple' in vnode.data.attrs) {
        elm.setAttribute('multiple', 'multiple');
      }
      return elm
    }

    function createElementNS(namespace, tagName) {
      return document.createElementNS(namespaceMap[namespace], tagName)
    }

    function createTextNode(text) {
      return document.createTextNode(text)
    }

    function createComment(text) {
      return document.createComment(text)
    }

    function insertBefore(parentNode, newNode, referenceNode) {
      parentNode.insertBefore(newNode, referenceNode);
    }

    function removeChild(node, child) {
      node.removeChild(child);
    }

    function appendChild(node, child) {
      node.appendChild(child);
    }

    function parentNode(node) {
      return node.parentNode
    }

    function nextSibling(node) {
      return node.nextSibling
    }

    function tagName(node) {
      return node.tagName
    }

    function setTextContent(node, text) {
      node.textContent = text;
    }

    function setAttribute(node, key, val) {
      node.setAttribute(key, val);
    }


    var nodeOps = Object.freeze({
      createElement: createElement$1,
      createElementNS: createElementNS,
      createTextNode: createTextNode,
      createComment: createComment,
      insertBefore: insertBefore,
      removeChild: removeChild,
      appendChild: appendChild,
      parentNode: parentNode,
      nextSibling: nextSibling,
      tagName: tagName,
      setTextContent: setTextContent,
      setAttribute: setAttribute
    });

    /*  */

    var ref = {
      create: function create(_, vnode) {
        registerRef(vnode);
      },
      update: function update(oldVnode, vnode) {
        if (oldVnode.data.ref !== vnode.data.ref) {
          registerRef(oldVnode, true);
          registerRef(vnode);
        }
      },
      destroy: function destroy(vnode) {
        registerRef(vnode, true);
      }
    };

    function registerRef(vnode, isRemoval) {
      var key = vnode.data.ref;
      if (!key) { return }

      var vm = vnode.context;
      var ref = vnode.componentInstance || vnode.elm;
      var refs = vm.$refs;
      if (isRemoval) {
        if (Array.isArray(refs[key])) {
          remove$1(refs[key], ref);
        } else if (refs[key] === ref) {
          refs[key] = undefined;
        }
      } else {
        if (vnode.data.refInFor) {
          if (Array.isArray(refs[key]) && refs[key].indexOf(ref) < 0) {
            refs[key].push(ref);
          } else {
            refs[key] = [ref];
          }
        } else {
          refs[key] = ref;
        }
      }
    }

    /**
     * Virtual DOM patching algorithm based on Snabbdom by
     * Simon Friis Vindum (@paldepind)
     * Licensed under the MIT License
     * https://github.com/paldepind/snabbdom/blob/master/LICENSE
     *
     * modified by Evan You (@yyx990803)
     *
    
    /*
     * Not type-checking this because this file is perf-critical and the cost
     * of making flow understand it is not worth it.
     */

    var emptyNode = new VNode('', {}, []);

    var hooks$1 = ['create', 'activate', 'update', 'remove', 'destroy'];

    function isUndef(s) {
      return s == null
    }

    function isDef(s) {
      return s != null
    }

    function sameVnode(vnode1, vnode2) {
      return (
        vnode1.key === vnode2.key &&
        vnode1.tag === vnode2.tag &&
        vnode1.isComment === vnode2.isComment &&
        !vnode1.data === !vnode2.data
      )
    }

    function createKeyToOldIdx(children, beginIdx, endIdx) {
      var i, key;
      var map = {};
      for (i = beginIdx; i <= endIdx; ++i) {
        key = children[i].key;
        if (isDef(key)) { map[key] = i; }
      }
      return map
    }

    function createPatchFunction(backend) {
      var i, j;
      var cbs = {};

      var modules = backend.modules;
      var nodeOps = backend.nodeOps;

      for (i = 0; i < hooks$1.length; ++i) {
        cbs[hooks$1[i]] = [];
        for (j = 0; j < modules.length; ++j) {
          if (modules[j][hooks$1[i]] !== undefined) { cbs[hooks$1[i]].push(modules[j][hooks$1[i]]); }
        }
      }

      function emptyNodeAt(elm) {
        return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
      }

      function createRmCb(childElm, listeners) {
        function remove$$1() {
          if (--remove$$1.listeners === 0) {
            removeNode(childElm);
          }
        }
        remove$$1.listeners = listeners;
        return remove$$1
      }

      function removeNode(el) {
        var parent = nodeOps.parentNode(el);
        // element may have already been removed due to v-html / v-text
        if (parent) {
          nodeOps.removeChild(parent, el);
        }
      }

      var inPre = 0;
      function createElm(vnode, insertedVnodeQueue, parentElm, refElm, nested) {
        vnode.isRootInsert = !nested; // for transition enter check
        if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
          return
        }

        var data = vnode.data;
        var children = vnode.children;
        var tag = vnode.tag;
        if (isDef(tag)) {
          {
            if (data && data.pre) {
              inPre++;
            }
            if (
              !inPre &&
              !vnode.ns &&
              !(config.ignoredElements.length && config.ignoredElements.indexOf(tag) > -1) &&
              config.isUnknownElement(tag)
            ) {
              warn(
                'Unknown custom element: <' + tag + '> - did you ' +
                'register the component correctly? For recursive components, ' +
                'make sure to provide the "name" option.',
                vnode.context
              );
            }
          }
          vnode.elm = vnode.ns
            ? nodeOps.createElementNS(vnode.ns, tag)
            : nodeOps.createElement(tag, vnode);
          setScope(vnode);

          /* istanbul ignore if */
          {
            createChildren(vnode, children, insertedVnodeQueue);
            if (isDef(data)) {
              invokeCreateHooks(vnode, insertedVnodeQueue);
            }
            insert(parentElm, vnode.elm, refElm);
          }

          if ("development" !== 'production' && data && data.pre) {
            inPre--;
          }
        } else if (vnode.isComment) {
          vnode.elm = nodeOps.createComment(vnode.text);
          insert(parentElm, vnode.elm, refElm);
        } else {
          vnode.elm = nodeOps.createTextNode(vnode.text);
          insert(parentElm, vnode.elm, refElm);
        }
      }

      function createComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
        var i = vnode.data;
        if (isDef(i)) {
          var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
          if (isDef(i = i.hook) && isDef(i = i.init)) {
            i(vnode, false /* hydrating */, parentElm, refElm);
          }
          // after calling the init hook, if the vnode is a child component
          // it should've created a child instance and mounted it. the child
          // component also has set the placeholder vnode's elm.
          // in that case we can just return the element and be done.
          if (isDef(vnode.componentInstance)) {
            initComponent(vnode, insertedVnodeQueue);
            if (isReactivated) {
              reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
            }
            return true
          }
        }
      }

      function initComponent(vnode, insertedVnodeQueue) {
        if (vnode.data.pendingInsert) {
          insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
        }
        vnode.elm = vnode.componentInstance.$el;
        if (isPatchable(vnode)) {
          invokeCreateHooks(vnode, insertedVnodeQueue);
          setScope(vnode);
        } else {
          // empty component root.
          // skip all element-related modules except for ref (#3455)
          registerRef(vnode);
          // make sure to invoke the insert hook
          insertedVnodeQueue.push(vnode);
        }
      }

      function reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
        var i;
        // hack for #4339: a reactivated component with inner transition
        // does not trigger because the inner node's created hooks are not called
        // again. It's not ideal to involve module-specific logic in here but
        // there doesn't seem to be a better way to do it.
        var innerNode = vnode;
        while (innerNode.componentInstance) {
          innerNode = innerNode.componentInstance._vnode;
          if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
            for (i = 0; i < cbs.activate.length; ++i) {
              cbs.activate[i](emptyNode, innerNode);
            }
            insertedVnodeQueue.push(innerNode);
            break
          }
        }
        // unlike a newly created component,
        // a reactivated keep-alive component doesn't insert itself
        insert(parentElm, vnode.elm, refElm);
      }

      function insert(parent, elm, ref) {
        if (parent) {
          if (ref) {
            nodeOps.insertBefore(parent, elm, ref);
          } else {
            nodeOps.appendChild(parent, elm);
          }
        }
      }

      function createChildren(vnode, children, insertedVnodeQueue) {
        if (Array.isArray(children)) {
          for (var i = 0; i < children.length; ++i) {
            createElm(children[i], insertedVnodeQueue, vnode.elm, null, true);
          }
        } else if (isPrimitive(vnode.text)) {
          nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(vnode.text));
        }
      }

      function isPatchable(vnode) {
        while (vnode.componentInstance) {
          vnode = vnode.componentInstance._vnode;
        }
        return isDef(vnode.tag)
      }

      function invokeCreateHooks(vnode, insertedVnodeQueue) {
        for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
          cbs.create[i$1](emptyNode, vnode);
        }
        i = vnode.data.hook; // Reuse variable
        if (isDef(i)) {
          if (i.create) { i.create(emptyNode, vnode); }
          if (i.insert) { insertedVnodeQueue.push(vnode); }
        }
      }

      // set scope id attribute for scoped CSS.
      // this is implemented as a special case to avoid the overhead
      // of going through the normal attribute patching process.
      function setScope(vnode) {
        var i;
        if (isDef(i = vnode.context) && isDef(i = i.$options._scopeId)) {
          nodeOps.setAttribute(vnode.elm, i, '');
        }
        if (isDef(i = activeInstance) &&
          i !== vnode.context &&
          isDef(i = i.$options._scopeId)) {
          nodeOps.setAttribute(vnode.elm, i, '');
        }
      }

      function addVnodes(parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
        for (; startIdx <= endIdx; ++startIdx) {
          createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm);
        }
      }

      function invokeDestroyHook(vnode) {
        var i, j;
        var data = vnode.data;
        if (isDef(data)) {
          if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
          for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
        }
        if (isDef(i = vnode.children)) {
          for (j = 0; j < vnode.children.length; ++j) {
            invokeDestroyHook(vnode.children[j]);
          }
        }
      }

      function removeVnodes(parentElm, vnodes, startIdx, endIdx) {
        for (; startIdx <= endIdx; ++startIdx) {
          var ch = vnodes[startIdx];
          if (isDef(ch)) {
            if (isDef(ch.tag)) {
              removeAndInvokeRemoveHook(ch);
              invokeDestroyHook(ch);
            } else { // Text node
              removeNode(ch.elm);
            }
          }
        }
      }

      function removeAndInvokeRemoveHook(vnode, rm) {
        if (rm || isDef(vnode.data)) {
          var listeners = cbs.remove.length + 1;
          if (!rm) {
            // directly removing
            rm = createRmCb(vnode.elm, listeners);
          } else {
            // we have a recursively passed down rm callback
            // increase the listeners count
            rm.listeners += listeners;
          }
          // recursively invoke hooks on child component root node
          if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
            removeAndInvokeRemoveHook(i, rm);
          }
          for (i = 0; i < cbs.remove.length; ++i) {
            cbs.remove[i](vnode, rm);
          }
          if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
            i(vnode, rm);
          } else {
            rm();
          }
        } else {
          removeNode(vnode.elm);
        }
      }

      function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
        var oldStartIdx = 0;
        var newStartIdx = 0;
        var oldEndIdx = oldCh.length - 1;
        var oldStartVnode = oldCh[0];
        var oldEndVnode = oldCh[oldEndIdx];
        var newEndIdx = newCh.length - 1;
        var newStartVnode = newCh[0];
        var newEndVnode = newCh[newEndIdx];
        var oldKeyToIdx, idxInOld, elmToMove, refElm;

        // removeOnly is a special flag used only by <transition-group>
        // to ensure removed elements stay in correct relative positions
        // during leaving transitions
        var canMove = !removeOnly;

        while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
          if (isUndef(oldStartVnode)) {
            oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
          } else if (isUndef(oldEndVnode)) {
            oldEndVnode = oldCh[--oldEndIdx];
          } else if (sameVnode(oldStartVnode, newStartVnode)) {
            patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
            oldStartVnode = oldCh[++oldStartIdx];
            newStartVnode = newCh[++newStartIdx];
          } else if (sameVnode(oldEndVnode, newEndVnode)) {
            patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
            oldEndVnode = oldCh[--oldEndIdx];
            newEndVnode = newCh[--newEndIdx];
          } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
            patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
            canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
            oldStartVnode = oldCh[++oldStartIdx];
            newEndVnode = newCh[--newEndIdx];
          } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
            patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
            canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
            oldEndVnode = oldCh[--oldEndIdx];
            newStartVnode = newCh[++newStartIdx];
          } else {
            if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
            idxInOld = isDef(newStartVnode.key) ? oldKeyToIdx[newStartVnode.key] : null;
            if (isUndef(idxInOld)) { // New element
              createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
              newStartVnode = newCh[++newStartIdx];
            } else {
              elmToMove = oldCh[idxInOld];
              /* istanbul ignore if */
              if ("development" !== 'production' && !elmToMove) {
                warn(
                  'It seems there are duplicate keys that is causing an update error. ' +
                  'Make sure each v-for item has a unique key.'
                );
              }
              if (sameVnode(elmToMove, newStartVnode)) {
                patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
                oldCh[idxInOld] = undefined;
                canMove && nodeOps.insertBefore(parentElm, newStartVnode.elm, oldStartVnode.elm);
                newStartVnode = newCh[++newStartIdx];
              } else {
                // same key but different element. treat as new element
                createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
                newStartVnode = newCh[++newStartIdx];
              }
            }
          }
        }
        if (oldStartIdx > oldEndIdx) {
          refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
          addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
        } else if (newStartIdx > newEndIdx) {
          removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
        }
      }

      function patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly) {
        if (oldVnode === vnode) {
          return
        }
        // reuse element for static trees.
        // note we only do this if the vnode is cloned -
        // if the new node is not cloned it means the render functions have been
        // reset by the hot-reload-api and we need to do a proper re-render.
        if (vnode.isStatic &&
          oldVnode.isStatic &&
          vnode.key === oldVnode.key &&
          (vnode.isCloned || vnode.isOnce)) {
          vnode.elm = oldVnode.elm;
          vnode.componentInstance = oldVnode.componentInstance;
          return
        }
        var i;
        var data = vnode.data;
        var hasData = isDef(data);
        if (hasData && isDef(i = data.hook) && isDef(i = i.prepatch)) {
          i(oldVnode, vnode);
        }
        var elm = vnode.elm = oldVnode.elm;
        var oldCh = oldVnode.children;
        var ch = vnode.children;
        if (hasData && isPatchable(vnode)) {
          for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
          if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
        }
        if (isUndef(vnode.text)) {
          if (isDef(oldCh) && isDef(ch)) {
            if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
          } else if (isDef(ch)) {
            if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
            addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
          } else if (isDef(oldCh)) {
            removeVnodes(elm, oldCh, 0, oldCh.length - 1);
          } else if (isDef(oldVnode.text)) {
            nodeOps.setTextContent(elm, '');
          }
        } else if (oldVnode.text !== vnode.text) {
          nodeOps.setTextContent(elm, vnode.text);
        }
        if (hasData) {
          if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
        }
      }

      function invokeInsertHook(vnode, queue, initial) {
        // delay insert hooks for component root nodes, invoke them after the
        // element is really inserted
        if (initial && vnode.parent) {
          vnode.parent.data.pendingInsert = queue;
        } else {
          for (var i = 0; i < queue.length; ++i) {
            queue[i].data.hook.insert(queue[i]);
          }
        }
      }

      var bailed = false;
      // list of modules that can skip create hook during hydration because they
      // are already rendered on the client or has no need for initialization
      var isRenderedModule = makeMap('attrs,style,class,staticClass,staticStyle,key');

      // Note: this is a browser-only function so we can assume elms are DOM nodes.
      function hydrate(elm, vnode, insertedVnodeQueue) {
        {
          if (!assertNodeMatch(elm, vnode)) {
            return false
          }
        }
        vnode.elm = elm;
        var tag = vnode.tag;
        var data = vnode.data;
        var children = vnode.children;
        if (isDef(data)) {
          if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
          if (isDef(i = vnode.componentInstance)) {
            // child component. it should have hydrated its own tree.
            initComponent(vnode, insertedVnodeQueue);
            return true
          }
        }
        if (isDef(tag)) {
          if (isDef(children)) {
            // empty element, allow client to pick up and populate children
            if (!elm.hasChildNodes()) {
              createChildren(vnode, children, insertedVnodeQueue);
            } else {
              var childrenMatch = true;
              var childNode = elm.firstChild;
              for (var i$1 = 0; i$1 < children.length; i$1++) {
                if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue)) {
                  childrenMatch = false;
                  break
                }
                childNode = childNode.nextSibling;
              }
              // if childNode is not null, it means the actual childNodes list is
              // longer than the virtual children list.
              if (!childrenMatch || childNode) {
                if ("development" !== 'production' &&
                  typeof console !== 'undefined' &&
                  !bailed) {
                  bailed = true;
                  console.warn('Parent: ', elm);
                  console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                }
                return false
              }
            }
          }
          if (isDef(data)) {
            for (var key in data) {
              if (!isRenderedModule(key)) {
                invokeCreateHooks(vnode, insertedVnodeQueue);
                break
              }
            }
          }
        } else if (elm.data !== vnode.text) {
          elm.data = vnode.text;
        }
        return true
      }

      function assertNodeMatch(node, vnode) {
        if (vnode.tag) {
          return (
            vnode.tag.indexOf('vue-component') === 0 ||
            vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
          )
        } else {
          return node.nodeType === (vnode.isComment ? 8 : 3)
        }
      }

      return function patch(oldVnode, vnode, hydrating, removeOnly, parentElm, refElm) {
        if (!vnode) {
          if (oldVnode) { invokeDestroyHook(oldVnode); }
          return
        }

        var isInitialPatch = false;
        var insertedVnodeQueue = [];

        if (!oldVnode) {
          // empty mount (likely as component), create new root element
          isInitialPatch = true;
          createElm(vnode, insertedVnodeQueue, parentElm, refElm);
        } else {
          var isRealElement = isDef(oldVnode.nodeType);
          if (!isRealElement && sameVnode(oldVnode, vnode)) {
            // patch existing root node
            patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly);
          } else {
            if (isRealElement) {
              // mounting to a real element
              // check if this is server-rendered content and if we can perform
              // a successful hydration.
              if (oldVnode.nodeType === 1 && oldVnode.hasAttribute('server-rendered')) {
                oldVnode.removeAttribute('server-rendered');
                hydrating = true;
              }
              if (hydrating) {
                if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                  invokeInsertHook(vnode, insertedVnodeQueue, true);
                  return oldVnode
                } else {
                  warn(
                    'The client-side rendered virtual DOM tree is not matching ' +
                    'server-rendered content. This is likely caused by incorrect ' +
                    'HTML markup, for example nesting block-level elements inside ' +
                    '<p>, or missing <tbody>. Bailing hydration and performing ' +
                    'full client-side render.'
                  );
                }
              }
              // either not server-rendered, or hydration failed.
              // create an empty node and replace it
              oldVnode = emptyNodeAt(oldVnode);
            }
            // replacing existing element
            var oldElm = oldVnode.elm;
            var parentElm$1 = nodeOps.parentNode(oldElm);
            createElm(
              vnode,
              insertedVnodeQueue,
              // extremely rare edge case: do not insert if old element is in a
              // leaving transition. Only happens when combining transition +
              // keep-alive + HOCs. (#4590)
              oldElm._leaveCb ? null : parentElm$1,
              nodeOps.nextSibling(oldElm)
            );

            if (vnode.parent) {
              // component root element replaced.
              // update parent placeholder node element, recursively
              var ancestor = vnode.parent;
              while (ancestor) {
                ancestor.elm = vnode.elm;
                ancestor = ancestor.parent;
              }
              if (isPatchable(vnode)) {
                for (var i = 0; i < cbs.create.length; ++i) {
                  cbs.create[i](emptyNode, vnode.parent);
                }
              }
            }

            if (parentElm$1 !== null) {
              removeVnodes(parentElm$1, [oldVnode], 0, 0);
            } else if (isDef(oldVnode.tag)) {
              invokeDestroyHook(oldVnode);
            }
          }
        }

        invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
        return vnode.elm
      }
    }

    /*  */

    var directives = {
      create: updateDirectives,
      update: updateDirectives,
      destroy: function unbindDirectives(vnode) {
        updateDirectives(vnode, emptyNode);
      }
    };

    function updateDirectives(oldVnode, vnode) {
      if (oldVnode.data.directives || vnode.data.directives) {
        _update(oldVnode, vnode);
      }
    }

    function _update(oldVnode, vnode) {
      var isCreate = oldVnode === emptyNode;
      var isDestroy = vnode === emptyNode;
      var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
      var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);

      var dirsWithInsert = [];
      var dirsWithPostpatch = [];

      var key, oldDir, dir;
      for (key in newDirs) {
        oldDir = oldDirs[key];
        dir = newDirs[key];
        if (!oldDir) {
          // new directive, bind
          callHook$1(dir, 'bind', vnode, oldVnode);
          if (dir.def && dir.def.inserted) {
            dirsWithInsert.push(dir);
          }
        } else {
          // existing directive, update
          dir.oldValue = oldDir.value;
          callHook$1(dir, 'update', vnode, oldVnode);
          if (dir.def && dir.def.componentUpdated) {
            dirsWithPostpatch.push(dir);
          }
        }
      }

      if (dirsWithInsert.length) {
        var callInsert = function () {
          for (var i = 0; i < dirsWithInsert.length; i++) {
            callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
          }
        };
        if (isCreate) {
          mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'insert', callInsert, 'dir-insert');
        } else {
          callInsert();
        }
      }

      if (dirsWithPostpatch.length) {
        mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'postpatch', function () {
          for (var i = 0; i < dirsWithPostpatch.length; i++) {
            callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
          }
        }, 'dir-postpatch');
      }

      if (!isCreate) {
        for (key in oldDirs) {
          if (!newDirs[key]) {
            // no longer present, unbind
            callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
          }
        }
      }
    }

    var emptyModifiers = Object.create(null);

    function normalizeDirectives$1(
      dirs,
      vm
    ) {
      var res = Object.create(null);
      if (!dirs) {
        return res
      }
      var i, dir;
      for (i = 0; i < dirs.length; i++) {
        dir = dirs[i];
        if (!dir.modifiers) {
          dir.modifiers = emptyModifiers;
        }
        res[getRawDirName(dir)] = dir;
        dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
      }
      return res
    }

    function getRawDirName(dir) {
      return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
    }

    function callHook$1(dir, hook, vnode, oldVnode, isDestroy) {
      var fn = dir.def && dir.def[hook];
      if (fn) {
        fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
      }
    }

    var baseModules = [
      ref,
      directives
    ];

    /*  */

    function updateAttrs(oldVnode, vnode) {
      if (!oldVnode.data.attrs && !vnode.data.attrs) {
        return
      }
      var key, cur, old;
      var elm = vnode.elm;
      var oldAttrs = oldVnode.data.attrs || {};
      var attrs = vnode.data.attrs || {};
      // clone observed objects, as the user probably wants to mutate it
      if (attrs.__ob__) {
        attrs = vnode.data.attrs = extend({}, attrs);
      }

      for (key in attrs) {
        cur = attrs[key];
        old = oldAttrs[key];
        if (old !== cur) {
          setAttr(elm, key, cur);
        }
      }
      // #4391: in IE9, setting type can reset value for input[type=radio]
      /* istanbul ignore if */
      if (isIE9 && attrs.value !== oldAttrs.value) {
        setAttr(elm, 'value', attrs.value);
      }
      for (key in oldAttrs) {
        if (attrs[key] == null) {
          if (isXlink(key)) {
            elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
          } else if (!isEnumeratedAttr(key)) {
            elm.removeAttribute(key);
          }
        }
      }
    }

    function setAttr(el, key, value) {
      if (isBooleanAttr(key)) {
        // set attribute for blank value
        // e.g. <option disabled>Select one</option>
        if (isFalsyAttrValue(value)) {
          el.removeAttribute(key);
        } else {
          el.setAttribute(key, key);
        }
      } else if (isEnumeratedAttr(key)) {
        el.setAttribute(key, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true');
      } else if (isXlink(key)) {
        if (isFalsyAttrValue(value)) {
          el.removeAttributeNS(xlinkNS, getXlinkProp(key));
        } else {
          el.setAttributeNS(xlinkNS, key, value);
        }
      } else {
        if (isFalsyAttrValue(value)) {
          el.removeAttribute(key);
        } else {
          el.setAttribute(key, value);
        }
      }
    }

    var attrs = {
      create: updateAttrs,
      update: updateAttrs
    };

    /*  */

    function updateClass(oldVnode, vnode) {
      var el = vnode.elm;
      var data = vnode.data;
      var oldData = oldVnode.data;
      if (!data.staticClass && !data.class &&
        (!oldData || (!oldData.staticClass && !oldData.class))) {
        return
      }

      var cls = genClassForVnode(vnode);

      // handle transition classes
      var transitionClass = el._transitionClasses;
      if (transitionClass) {
        cls = concat(cls, stringifyClass(transitionClass));
      }

      // set the class
      if (cls !== el._prevClass) {
        el.setAttribute('class', cls);
        el._prevClass = cls;
      }
    }

    var klass = {
      create: updateClass,
      update: updateClass
    };

    /*  */

    var target$1;

    function add$2(
      event,
      handler,
      once,
      capture
    ) {
      if (once) {
        var oldHandler = handler;
        var _target = target$1; // save current target element in closure
        handler = function (ev) {
          remove$3(event, handler, capture, _target);
          arguments.length === 1
            ? oldHandler(ev)
            : oldHandler.apply(null, arguments);
        };
      }
      target$1.addEventListener(event, handler, capture);
    }

    function remove$3(
      event,
      handler,
      capture,
      _target
    ) {
      (_target || target$1).removeEventListener(event, handler, capture);
    }

    function updateDOMListeners(oldVnode, vnode) {
      if (!oldVnode.data.on && !vnode.data.on) {
        return
      }
      var on = vnode.data.on || {};
      var oldOn = oldVnode.data.on || {};
      target$1 = vnode.elm;
      updateListeners(on, oldOn, add$2, remove$3, vnode.context);
    }

    var events = {
      create: updateDOMListeners,
      update: updateDOMListeners
    };

    /*  */

    function updateDOMProps(oldVnode, vnode) {
      if (!oldVnode.data.domProps && !vnode.data.domProps) {
        return
      }
      var key, cur;
      var elm = vnode.elm;
      var oldProps = oldVnode.data.domProps || {};
      var props = vnode.data.domProps || {};
      // clone observed objects, as the user probably wants to mutate it
      if (props.__ob__) {
        props = vnode.data.domProps = extend({}, props);
      }

      for (key in oldProps) {
        if (props[key] == null) {
          elm[key] = '';
        }
      }
      for (key in props) {
        cur = props[key];
        // ignore children if the node has textContent or innerHTML,
        // as these will throw away existing DOM nodes and cause removal errors
        // on subsequent patches (#3360)
        if (key === 'textContent' || key === 'innerHTML') {
          if (vnode.children) { vnode.children.length = 0; }
          if (cur === oldProps[key]) { continue }
        }

        if (key === 'value') {
          // store value as _value as well since
          // non-string values will be stringified
          elm._value = cur;
          // avoid resetting cursor position when value is the same
          var strCur = cur == null ? '' : String(cur);
          if (shouldUpdateValue(elm, vnode, strCur)) {
            elm.value = strCur;
          }
        } else {
          elm[key] = cur;
        }
      }
    }

    // check platforms/web/util/attrs.js acceptValue


    function shouldUpdateValue(
      elm,
      vnode,
      checkVal
    ) {
      return (!elm.composing && (
        vnode.tag === 'option' ||
        isDirty(elm, checkVal) ||
        isInputChanged(vnode, checkVal)
      ))
    }

    function isDirty(elm, checkVal) {
      // return true when textbox (.number and .trim) loses focus and its value is not equal to the updated value
      return document.activeElement !== elm && elm.value !== checkVal
    }

    function isInputChanged(vnode, newVal) {
      var value = vnode.elm.value;
      var modifiers = vnode.elm._vModifiers; // injected by v-model runtime
      if ((modifiers && modifiers.number) || vnode.elm.type === 'number') {
        return toNumber(value) !== toNumber(newVal)
      }
      if (modifiers && modifiers.trim) {
        return value.trim() !== newVal.trim()
      }
      return value !== newVal
    }

    var domProps = {
      create: updateDOMProps,
      update: updateDOMProps
    };

    /*  */

    var parseStyleText = cached(function (cssText) {
      var res = {};
      var listDelimiter = /;(?![^(]*\))/g;
      var propertyDelimiter = /:(.+)/;
      cssText.split(listDelimiter).forEach(function (item) {
        if (item) {
          var tmp = item.split(propertyDelimiter);
          tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
        }
      });
      return res
    });

    // merge static and dynamic style data on the same vnode
    function normalizeStyleData(data) {
      var style = normalizeStyleBinding(data.style);
      // static style is pre-processed into an object during compilation
      // and is always a fresh object, so it's safe to merge into it
      return data.staticStyle
        ? extend(data.staticStyle, style)
        : style
    }

    // normalize possible array / string values into Object
    function normalizeStyleBinding(bindingStyle) {
      if (Array.isArray(bindingStyle)) {
        return toObject(bindingStyle)
      }
      if (typeof bindingStyle === 'string') {
        return parseStyleText(bindingStyle)
      }
      return bindingStyle
    }

    /**
     * parent component style should be after child's
     * so that parent component's style could override it
     */
    function getStyle(vnode, checkChild) {
      var res = {};
      var styleData;

      if (checkChild) {
        var childNode = vnode;
        while (childNode.componentInstance) {
          childNode = childNode.componentInstance._vnode;
          if (childNode.data && (styleData = normalizeStyleData(childNode.data))) {
            extend(res, styleData);
          }
        }
      }

      if ((styleData = normalizeStyleData(vnode.data))) {
        extend(res, styleData);
      }

      var parentNode = vnode;
      while ((parentNode = parentNode.parent)) {
        if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
          extend(res, styleData);
        }
      }
      return res
    }

    /*  */

    var cssVarRE = /^--/;
    var importantRE = /\s*!important$/;
    var setProp = function (el, name, val) {
      /* istanbul ignore if */
      if (cssVarRE.test(name)) {
        el.style.setProperty(name, val);
      } else if (importantRE.test(val)) {
        el.style.setProperty(name, val.replace(importantRE, ''), 'important');
      } else {
        el.style[normalize(name)] = val;
      }
    };

    var prefixes = ['Webkit', 'Moz', 'ms'];

    var testEl;
    var normalize = cached(function (prop) {
      testEl = testEl || document.createElement('div');
      prop = camelize(prop);
      if (prop !== 'filter' && (prop in testEl.style)) {
        return prop
      }
      var upper = prop.charAt(0).toUpperCase() + prop.slice(1);
      for (var i = 0; i < prefixes.length; i++) {
        var prefixed = prefixes[i] + upper;
        if (prefixed in testEl.style) {
          return prefixed
        }
      }
    });

    function updateStyle(oldVnode, vnode) {
      var data = vnode.data;
      var oldData = oldVnode.data;

      if (!data.staticStyle && !data.style &&
        !oldData.staticStyle && !oldData.style) {
        return
      }

      var cur, name;
      var el = vnode.elm;
      var oldStaticStyle = oldVnode.data.staticStyle;
      var oldStyleBinding = oldVnode.data.style || {};

      // if static style exists, stylebinding already merged into it when doing normalizeStyleData
      var oldStyle = oldStaticStyle || oldStyleBinding;

      var style = normalizeStyleBinding(vnode.data.style) || {};

      vnode.data.style = style.__ob__ ? extend({}, style) : style;

      var newStyle = getStyle(vnode, true);

      for (name in oldStyle) {
        if (newStyle[name] == null) {
          setProp(el, name, '');
        }
      }
      for (name in newStyle) {
        cur = newStyle[name];
        if (cur !== oldStyle[name]) {
          // ie9 setting to null has no effect, must use empty string
          setProp(el, name, cur == null ? '' : cur);
        }
      }
    }

    var style = {
      create: updateStyle,
      update: updateStyle
    };

    /*  */

    /**
     * Add class with compatibility for SVG since classList is not supported on
     * SVG elements in IE
     */
    function addClass(el, cls) {
      /* istanbul ignore if */
      if (!cls || !cls.trim()) {
        return
      }

      /* istanbul ignore else */
      if (el.classList) {
        if (cls.indexOf(' ') > -1) {
          cls.split(/\s+/).forEach(function (c) { return el.classList.add(c); });
        } else {
          el.classList.add(cls);
        }
      } else {
        var cur = ' ' + el.getAttribute('class') + ' ';
        if (cur.indexOf(' ' + cls + ' ') < 0) {
          el.setAttribute('class', (cur + cls).trim());
        }
      }
    }

    /**
     * Remove class with compatibility for SVG since classList is not supported on
     * SVG elements in IE
     */
    function removeClass(el, cls) {
      /* istanbul ignore if */
      if (!cls || !cls.trim()) {
        return
      }

      /* istanbul ignore else */
      if (el.classList) {
        if (cls.indexOf(' ') > -1) {
          cls.split(/\s+/).forEach(function (c) { return el.classList.remove(c); });
        } else {
          el.classList.remove(cls);
        }
      } else {
        var cur = ' ' + el.getAttribute('class') + ' ';
        var tar = ' ' + cls + ' ';
        while (cur.indexOf(tar) >= 0) {
          cur = cur.replace(tar, ' ');
        }
        el.setAttribute('class', cur.trim());
      }
    }

    /*  */

    var hasTransition = inBrowser && !isIE9;
    var TRANSITION = 'transition';
    var ANIMATION = 'animation';

    // Transition property/event sniffing
    var transitionProp = 'transition';
    var transitionEndEvent = 'transitionend';
    var animationProp = 'animation';
    var animationEndEvent = 'animationend';
    if (hasTransition) {
      /* istanbul ignore if */
      if (window.ontransitionend === undefined &&
        window.onwebkittransitionend !== undefined) {
        transitionProp = 'WebkitTransition';
        transitionEndEvent = 'webkitTransitionEnd';
      }
      if (window.onanimationend === undefined &&
        window.onwebkitanimationend !== undefined) {
        animationProp = 'WebkitAnimation';
        animationEndEvent = 'webkitAnimationEnd';
      }
    }

    // binding to window is necessary to make hot reload work in IE in strict mode
    var raf = inBrowser && window.requestAnimationFrame
      ? window.requestAnimationFrame.bind(window)
      : setTimeout;

    function nextFrame(fn) {
      raf(function () {
        raf(fn);
      });
    }

    function addTransitionClass(el, cls) {
      (el._transitionClasses || (el._transitionClasses = [])).push(cls);
      addClass(el, cls);
    }

    function removeTransitionClass(el, cls) {
      if (el._transitionClasses) {
        remove$1(el._transitionClasses, cls);
      }
      removeClass(el, cls);
    }

    function whenTransitionEnds(
      el,
      expectedType,
      cb
    ) {
      var ref = getTransitionInfo(el, expectedType);
      var type = ref.type;
      var timeout = ref.timeout;
      var propCount = ref.propCount;
      if (!type) { return cb() }
      var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
      var ended = 0;
      var end = function () {
        el.removeEventListener(event, onEnd);
        cb();
      };
      var onEnd = function (e) {
        if (e.target === el) {
          if (++ended >= propCount) {
            end();
          }
        }
      };
      setTimeout(function () {
        if (ended < propCount) {
          end();
        }
      }, timeout + 1);
      el.addEventListener(event, onEnd);
    }

    var transformRE = /\b(transform|all)(,|$)/;

    function getTransitionInfo(el, expectedType) {
      var styles = window.getComputedStyle(el);
      var transitioneDelays = styles[transitionProp + 'Delay'].split(', ');
      var transitionDurations = styles[transitionProp + 'Duration'].split(', ');
      var transitionTimeout = getTimeout(transitioneDelays, transitionDurations);
      var animationDelays = styles[animationProp + 'Delay'].split(', ');
      var animationDurations = styles[animationProp + 'Duration'].split(', ');
      var animationTimeout = getTimeout(animationDelays, animationDurations);

      var type;
      var timeout = 0;
      var propCount = 0;
      /* istanbul ignore if */
      if (expectedType === TRANSITION) {
        if (transitionTimeout > 0) {
          type = TRANSITION;
          timeout = transitionTimeout;
          propCount = transitionDurations.length;
        }
      } else if (expectedType === ANIMATION) {
        if (animationTimeout > 0) {
          type = ANIMATION;
          timeout = animationTimeout;
          propCount = animationDurations.length;
        }
      } else {
        timeout = Math.max(transitionTimeout, animationTimeout);
        type = timeout > 0
          ? transitionTimeout > animationTimeout
            ? TRANSITION
            : ANIMATION
          : null;
        propCount = type
          ? type === TRANSITION
            ? transitionDurations.length
            : animationDurations.length
          : 0;
      }
      var hasTransform =
        type === TRANSITION &&
        transformRE.test(styles[transitionProp + 'Property']);
      return {
        type: type,
        timeout: timeout,
        propCount: propCount,
        hasTransform: hasTransform
      }
    }

    function getTimeout(delays, durations) {
      /* istanbul ignore next */
      while (delays.length < durations.length) {
        delays = delays.concat(delays);
      }

      return Math.max.apply(null, durations.map(function (d, i) {
        return toMs(d) + toMs(delays[i])
      }))
    }

    function toMs(s) {
      return Number(s.slice(0, -1)) * 1000
    }

    /*  */

    function enter(vnode, toggleDisplay) {
      var el = vnode.elm;

      // call leave callback now
      if (el._leaveCb) {
        el._leaveCb.cancelled = true;
        el._leaveCb();
      }

      var data = resolveTransition(vnode.data.transition);
      if (!data) {
        return
      }

      /* istanbul ignore if */
      if (el._enterCb || el.nodeType !== 1) {
        return
      }

      var css = data.css;
      var type = data.type;
      var enterClass = data.enterClass;
      var enterToClass = data.enterToClass;
      var enterActiveClass = data.enterActiveClass;
      var appearClass = data.appearClass;
      var appearToClass = data.appearToClass;
      var appearActiveClass = data.appearActiveClass;
      var beforeEnter = data.beforeEnter;
      var enter = data.enter;
      var afterEnter = data.afterEnter;
      var enterCancelled = data.enterCancelled;
      var beforeAppear = data.beforeAppear;
      var appear = data.appear;
      var afterAppear = data.afterAppear;
      var appearCancelled = data.appearCancelled;

      // activeInstance will always be the <transition> component managing this
      // transition. One edge case to check is when the <transition> is placed
      // as the root node of a child component. In that case we need to check
      // <transition>'s parent for appear check.
      var context = activeInstance;
      var transitionNode = activeInstance.$vnode;
      while (transitionNode && transitionNode.parent) {
        transitionNode = transitionNode.parent;
        context = transitionNode.context;
      }

      var isAppear = !context._isMounted || !vnode.isRootInsert;

      if (isAppear && !appear && appear !== '') {
        return
      }

      var startClass = isAppear ? appearClass : enterClass;
      var activeClass = isAppear ? appearActiveClass : enterActiveClass;
      var toClass = isAppear ? appearToClass : enterToClass;
      var beforeEnterHook = isAppear ? (beforeAppear || beforeEnter) : beforeEnter;
      var enterHook = isAppear ? (typeof appear === 'function' ? appear : enter) : enter;
      var afterEnterHook = isAppear ? (afterAppear || afterEnter) : afterEnter;
      var enterCancelledHook = isAppear ? (appearCancelled || enterCancelled) : enterCancelled;

      var expectsCSS = css !== false && !isIE9;
      var userWantsControl =
        enterHook &&
        // enterHook may be a bound method which exposes
        // the length of original fn as _length
        (enterHook._length || enterHook.length) > 1;

      var cb = el._enterCb = once(function () {
        if (expectsCSS) {
          removeTransitionClass(el, toClass);
          removeTransitionClass(el, activeClass);
        }
        if (cb.cancelled) {
          if (expectsCSS) {
            removeTransitionClass(el, startClass);
          }
          enterCancelledHook && enterCancelledHook(el);
        } else {
          afterEnterHook && afterEnterHook(el);
        }
        el._enterCb = null;
      });

      if (!vnode.data.show) {
        // remove pending leave element on enter by injecting an insert hook
        mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'insert', function () {
          var parent = el.parentNode;
          var pendingNode = parent && parent._pending && parent._pending[vnode.key];
          if (pendingNode &&
            pendingNode.tag === vnode.tag &&
            pendingNode.elm._leaveCb) {
            pendingNode.elm._leaveCb();
          }
          enterHook && enterHook(el, cb);
        }, 'transition-insert');
      }

      // start enter transition
      beforeEnterHook && beforeEnterHook(el);
      if (expectsCSS) {
        addTransitionClass(el, startClass);
        addTransitionClass(el, activeClass);
        nextFrame(function () {
          addTransitionClass(el, toClass);
          removeTransitionClass(el, startClass);
          if (!cb.cancelled && !userWantsControl) {
            whenTransitionEnds(el, type, cb);
          }
        });
      }

      if (vnode.data.show) {
        toggleDisplay && toggleDisplay();
        enterHook && enterHook(el, cb);
      }

      if (!expectsCSS && !userWantsControl) {
        cb();
      }
    }

    function leave(vnode, rm) {
      var el = vnode.elm;

      // call enter callback now
      if (el._enterCb) {
        el._enterCb.cancelled = true;
        el._enterCb();
      }

      var data = resolveTransition(vnode.data.transition);
      if (!data) {
        return rm()
      }

      /* istanbul ignore if */
      if (el._leaveCb || el.nodeType !== 1) {
        return
      }

      var css = data.css;
      var type = data.type;
      var leaveClass = data.leaveClass;
      var leaveToClass = data.leaveToClass;
      var leaveActiveClass = data.leaveActiveClass;
      var beforeLeave = data.beforeLeave;
      var leave = data.leave;
      var afterLeave = data.afterLeave;
      var leaveCancelled = data.leaveCancelled;
      var delayLeave = data.delayLeave;

      var expectsCSS = css !== false && !isIE9;
      var userWantsControl =
        leave &&
        // leave hook may be a bound method which exposes
        // the length of original fn as _length
        (leave._length || leave.length) > 1;

      var cb = el._leaveCb = once(function () {
        if (el.parentNode && el.parentNode._pending) {
          el.parentNode._pending[vnode.key] = null;
        }
        if (expectsCSS) {
          removeTransitionClass(el, leaveToClass);
          removeTransitionClass(el, leaveActiveClass);
        }
        if (cb.cancelled) {
          if (expectsCSS) {
            removeTransitionClass(el, leaveClass);
          }
          leaveCancelled && leaveCancelled(el);
        } else {
          rm();
          afterLeave && afterLeave(el);
        }
        el._leaveCb = null;
      });

      if (delayLeave) {
        delayLeave(performLeave);
      } else {
        performLeave();
      }

      function performLeave() {
        // the delayed leave may have already been cancelled
        if (cb.cancelled) {
          return
        }
        // record leaving element
        if (!vnode.data.show) {
          (el.parentNode._pending || (el.parentNode._pending = {}))[vnode.key] = vnode;
        }
        beforeLeave && beforeLeave(el);
        if (expectsCSS) {
          addTransitionClass(el, leaveClass);
          addTransitionClass(el, leaveActiveClass);
          nextFrame(function () {
            addTransitionClass(el, leaveToClass);
            removeTransitionClass(el, leaveClass);
            if (!cb.cancelled && !userWantsControl) {
              whenTransitionEnds(el, type, cb);
            }
          });
        }
        leave && leave(el, cb);
        if (!expectsCSS && !userWantsControl) {
          cb();
        }
      }
    }

    function resolveTransition(def$$1) {
      if (!def$$1) {
        return
      }
      /* istanbul ignore else */
      if (typeof def$$1 === 'object') {
        var res = {};
        if (def$$1.css !== false) {
          extend(res, autoCssTransition(def$$1.name || 'v'));
        }
        extend(res, def$$1);
        return res
      } else if (typeof def$$1 === 'string') {
        return autoCssTransition(def$$1)
      }
    }

    var autoCssTransition = cached(function (name) {
      return {
        enterClass: (name + "-enter"),
        leaveClass: (name + "-leave"),
        appearClass: (name + "-enter"),
        enterToClass: (name + "-enter-to"),
        leaveToClass: (name + "-leave-to"),
        appearToClass: (name + "-enter-to"),
        enterActiveClass: (name + "-enter-active"),
        leaveActiveClass: (name + "-leave-active"),
        appearActiveClass: (name + "-enter-active")
      }
    });

    function once(fn) {
      var called = false;
      return function () {
        if (!called) {
          called = true;
          fn();
        }
      }
    }

    function _enter(_, vnode) {
      if (!vnode.data.show) {
        enter(vnode);
      }
    }

    var transition = inBrowser ? {
      create: _enter,
      activate: _enter,
      remove: function remove(vnode, rm) {
        /* istanbul ignore else */
        if (!vnode.data.show) {
          leave(vnode, rm);
        } else {
          rm();
        }
      }
    } : {};

    var platformModules = [
      attrs,
      klass,
      events,
      domProps,
      style,
      transition
    ];

    /*  */

    // the directive module should be applied last, after all
    // built-in modules have been applied.
    var modules = platformModules.concat(baseModules);

    var patch$1 = createPatchFunction({ nodeOps: nodeOps, modules: modules });

    /**
     * Not type checking this file because flow doesn't like attaching
     * properties to Elements.
     */

    var modelableTagRE = /^input|select|textarea|vue-component-[0-9]+(-[0-9a-zA-Z_-]*)?$/;

    /* istanbul ignore if */
    if (isIE9) {
      // http://www.matts411.com/post/internet-explorer-9-oninput/
      document.addEventListener('selectionchange', function () {
        var el = document.activeElement;
        if (el && el.vmodel) {
          trigger(el, 'input');
        }
      });
    }

    var model = {
      inserted: function inserted(el, binding, vnode) {
        {
          if (!modelableTagRE.test(vnode.tag)) {
            warn(
              "v-model is not supported on element type: <" + (vnode.tag) + ">. " +
              'If you are working with contenteditable, it\'s recommended to ' +
              'wrap a library dedicated for that purpose inside a custom component.',
              vnode.context
            );
          }
        }
        if (vnode.tag === 'select') {
          var cb = function () {
            setSelected(el, binding, vnode.context);
          };
          cb();
          /* istanbul ignore if */
          if (isIE || isEdge) {
            setTimeout(cb, 0);
          }
        } else if (vnode.tag === 'textarea' || el.type === 'text') {
          el._vModifiers = binding.modifiers;
          if (!binding.modifiers.lazy) {
            if (!isAndroid) {
              el.addEventListener('compositionstart', onCompositionStart);
              el.addEventListener('compositionend', onCompositionEnd);
            }
            /* istanbul ignore if */
            if (isIE9) {
              el.vmodel = true;
            }
          }
        }
      },
      componentUpdated: function componentUpdated(el, binding, vnode) {
        if (vnode.tag === 'select') {
          setSelected(el, binding, vnode.context);
          // in case the options rendered by v-for have changed,
          // it's possible that the value is out-of-sync with the rendered options.
          // detect such cases and filter out values that no longer has a matching
          // option in the DOM.
          var needReset = el.multiple
            ? binding.value.some(function (v) { return hasNoMatchingOption(v, el.options); })
            : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, el.options);
          if (needReset) {
            trigger(el, 'change');
          }
        }
      }
    };

    function setSelected(el, binding, vm) {
      var value = binding.value;
      var isMultiple = el.multiple;
      if (isMultiple && !Array.isArray(value)) {
        "development" !== 'production' && warn(
          "<select multiple v-model=\"" + (binding.expression) + "\"> " +
          "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
          vm
        );
        return
      }
      var selected, option;
      for (var i = 0, l = el.options.length; i < l; i++) {
        option = el.options[i];
        if (isMultiple) {
          selected = looseIndexOf(value, getValue(option)) > -1;
          if (option.selected !== selected) {
            option.selected = selected;
          }
        } else {
          if (looseEqual(getValue(option), value)) {
            if (el.selectedIndex !== i) {
              el.selectedIndex = i;
            }
            return
          }
        }
      }
      if (!isMultiple) {
        el.selectedIndex = -1;
      }
    }

    function hasNoMatchingOption(value, options) {
      for (var i = 0, l = options.length; i < l; i++) {
        if (looseEqual(getValue(options[i]), value)) {
          return false
        }
      }
      return true
    }

    function getValue(option) {
      return '_value' in option
        ? option._value
        : option.value
    }

    function onCompositionStart(e) {
      e.target.composing = true;
    }

    function onCompositionEnd(e) {
      e.target.composing = false;
      trigger(e.target, 'input');
    }

    function trigger(el, type) {
      var e = document.createEvent('HTMLEvents');
      e.initEvent(type, true, true);
      el.dispatchEvent(e);
    }

    /*  */

    // recursively search for possible transition defined inside the component root
    function locateNode(vnode) {
      return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
        ? locateNode(vnode.componentInstance._vnode)
        : vnode
    }

    var show = {
      bind: function bind(el, ref, vnode) {
        var value = ref.value;

        vnode = locateNode(vnode);
        var transition = vnode.data && vnode.data.transition;
        var originalDisplay = el.__vOriginalDisplay =
          el.style.display === 'none' ? '' : el.style.display;
        if (value && transition && !isIE9) {
          vnode.data.show = true;
          enter(vnode, function () {
            el.style.display = originalDisplay;
          });
        } else {
          el.style.display = value ? originalDisplay : 'none';
        }
      },

      update: function update(el, ref, vnode) {
        var value = ref.value;
        var oldValue = ref.oldValue;

        /* istanbul ignore if */
        if (value === oldValue) { return }
        vnode = locateNode(vnode);
        var transition = vnode.data && vnode.data.transition;
        if (transition && !isIE9) {
          vnode.data.show = true;
          if (value) {
            enter(vnode, function () {
              el.style.display = el.__vOriginalDisplay;
            });
          } else {
            leave(vnode, function () {
              el.style.display = 'none';
            });
          }
        } else {
          el.style.display = value ? el.__vOriginalDisplay : 'none';
        }
      },

      unbind: function unbind(
        el,
        binding,
        vnode,
        oldVnode,
        isDestroy
      ) {
        if (!isDestroy) {
          el.style.display = el.__vOriginalDisplay;
        }
      }
    };

    var platformDirectives = {
      model: model,
      show: show
    };

    /*  */

    // Provides transition support for a single element/component.
    // supports transition mode (out-in / in-out)

    var transitionProps = {
      name: String,
      appear: Boolean,
      css: Boolean,
      mode: String,
      type: String,
      enterClass: String,
      leaveClass: String,
      enterToClass: String,
      leaveToClass: String,
      enterActiveClass: String,
      leaveActiveClass: String,
      appearClass: String,
      appearActiveClass: String,
      appearToClass: String
    };

    // in case the child is also an abstract component, e.g. <keep-alive>
    // we want to recursively retrieve the real component to be rendered
    function getRealChild(vnode) {
      var compOptions = vnode && vnode.componentOptions;
      if (compOptions && compOptions.Ctor.options.abstract) {
        return getRealChild(getFirstComponentChild(compOptions.children))
      } else {
        return vnode
      }
    }

    function extractTransitionData(comp) {
      var data = {};
      var options = comp.$options;
      // props
      for (var key in options.propsData) {
        data[key] = comp[key];
      }
      // events.
      // extract listeners and pass them directly to the transition methods
      var listeners = options._parentListeners;
      for (var key$1 in listeners) {
        data[camelize(key$1)] = listeners[key$1].fn;
      }
      return data
    }

    function placeholder(h, rawChild) {
      return /\d-keep-alive$/.test(rawChild.tag)
        ? h('keep-alive')
        : null
    }

    function hasParentTransition(vnode) {
      while ((vnode = vnode.parent)) {
        if (vnode.data.transition) {
          return true
        }
      }
    }

    function isSameChild(child, oldChild) {
      return oldChild.key === child.key && oldChild.tag === child.tag
    }

    var Transition = {
      name: 'transition',
      props: transitionProps,
      abstract: true,

      render: function render(h) {
        var this$1 = this;

        var children = this.$slots.default;
        if (!children) {
          return
        }

        // filter out text nodes (possible whitespaces)
        children = children.filter(function (c) { return c.tag; });
        /* istanbul ignore if */
        if (!children.length) {
          return
        }

        // warn multiple elements
        if ("development" !== 'production' && children.length > 1) {
          warn(
            '<transition> can only be used on a single element. Use ' +
            '<transition-group> for lists.',
            this.$parent
          );
        }

        var mode = this.mode;

        // warn invalid mode
        if ("development" !== 'production' &&
          mode && mode !== 'in-out' && mode !== 'out-in') {
          warn(
            'invalid <transition> mode: ' + mode,
            this.$parent
          );
        }

        var rawChild = children[0];

        // if this is a component root node and the component's
        // parent container node also has transition, skip.
        if (hasParentTransition(this.$vnode)) {
          return rawChild
        }

        // apply transition data to child
        // use getRealChild() to ignore abstract components e.g. keep-alive
        var child = getRealChild(rawChild);
        /* istanbul ignore if */
        if (!child) {
          return rawChild
        }

        if (this._leaving) {
          return placeholder(h, rawChild)
        }

        // ensure a key that is unique to the vnode type and to this transition
        // component instance. This key will be used to remove pending leaving nodes
        // during entering.
        var id = "__transition-" + (this._uid) + "-";
        var key = child.key = child.key == null
          ? id + child.tag
          : isPrimitive(child.key)
            ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
            : child.key;
        var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
        var oldRawChild = this._vnode;
        var oldChild = getRealChild(oldRawChild);

        // mark v-show
        // so that the transition module can hand over the control to the directive
        if (child.data.directives && child.data.directives.some(function (d) { return d.name === 'show'; })) {
          child.data.show = true;
        }

        if (oldChild && oldChild.data && !isSameChild(child, oldChild)) {
          // replace old child transition data with fresh one
          // important for dynamic transitions!
          var oldData = oldChild && (oldChild.data.transition = extend({}, data));
          // handle transition mode
          if (mode === 'out-in') {
            // return placeholder node and queue update when leave finishes
            this._leaving = true;
            mergeVNodeHook(oldData, 'afterLeave', function () {
              this$1._leaving = false;
              this$1.$forceUpdate();
            }, key);
            return placeholder(h, rawChild)
          } else if (mode === 'in-out') {
            var delayedLeave;
            var performLeave = function () { delayedLeave(); };
            mergeVNodeHook(data, 'afterEnter', performLeave, key);
            mergeVNodeHook(data, 'enterCancelled', performLeave, key);
            mergeVNodeHook(oldData, 'delayLeave', function (leave) {
              delayedLeave = leave;
            }, key);
          }
        }

        return rawChild
      }
    };

    /*  */

    // Provides transition support for list items.
    // supports move transitions using the FLIP technique.

    // Because the vdom's children update algorithm is "unstable" - i.e.
    // it doesn't guarantee the relative positioning of removed elements,
    // we force transition-group to update its children into two passes:
    // in the first pass, we remove all nodes that need to be removed,
    // triggering their leaving transition; in the second pass, we insert/move
    // into the final disired state. This way in the second pass removed
    // nodes will remain where they should be.

    var props = extend({
      tag: String,
      moveClass: String
    }, transitionProps);

    delete props.mode;

    var TransitionGroup = {
      props: props,

      render: function render(h) {
        var tag = this.tag || this.$vnode.data.tag || 'span';
        var map = Object.create(null);
        var prevChildren = this.prevChildren = this.children;
        var rawChildren = this.$slots.default || [];
        var children = this.children = [];
        var transitionData = extractTransitionData(this);

        for (var i = 0; i < rawChildren.length; i++) {
          var c = rawChildren[i];
          if (c.tag) {
            if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
              children.push(c);
              map[c.key] = c
                ; (c.data || (c.data = {})).transition = transitionData;
            } else {
              var opts = c.componentOptions;
              var name = opts
                ? (opts.Ctor.options.name || opts.tag)
                : c.tag;
              warn(("<transition-group> children must be keyed: <" + name + ">"));
            }
          }
        }

        if (prevChildren) {
          var kept = [];
          var removed = [];
          for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
            var c$1 = prevChildren[i$1];
            c$1.data.transition = transitionData;
            c$1.data.pos = c$1.elm.getBoundingClientRect();
            if (map[c$1.key]) {
              kept.push(c$1);
            } else {
              removed.push(c$1);
            }
          }
          this.kept = h(tag, null, kept);
          this.removed = removed;
        }

        return h(tag, null, children)
      },

      beforeUpdate: function beforeUpdate() {
        // force removing pass
        this.__patch__(
          this._vnode,
          this.kept,
          false, // hydrating
          true // removeOnly (!important, avoids unnecessary moves)
        );
        this._vnode = this.kept;
      },

      updated: function updated() {
        var children = this.prevChildren;
        var moveClass = this.moveClass || ((this.name || 'v') + '-move');
        if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
          return
        }

        // we divide the work into three loops to avoid mixing DOM reads and writes
        // in each iteration - which helps prevent layout thrashing.
        children.forEach(callPendingCbs);
        children.forEach(recordPosition);
        children.forEach(applyTranslation);

        // force reflow to put everything in position
        var f = document.body.offsetHeight; // eslint-disable-line

        children.forEach(function (c) {
          if (c.data.moved) {
            var el = c.elm;
            var s = el.style;
            addTransitionClass(el, moveClass);
            s.transform = s.WebkitTransform = s.transitionDuration = '';
            el.addEventListener(transitionEndEvent, el._moveCb = function cb(e) {
              if (!e || /transform$/.test(e.propertyName)) {
                el.removeEventListener(transitionEndEvent, cb);
                el._moveCb = null;
                removeTransitionClass(el, moveClass);
              }
            });
          }
        });
      },

      methods: {
        hasMove: function hasMove(el, moveClass) {
          /* istanbul ignore if */
          if (!hasTransition) {
            return false
          }
          if (this._hasMove != null) {
            return this._hasMove
          }
          addTransitionClass(el, moveClass);
          var info = getTransitionInfo(el);
          removeTransitionClass(el, moveClass);
          return (this._hasMove = info.hasTransform)
        }
      }
    };

    function callPendingCbs(c) {
      /* istanbul ignore if */
      if (c.elm._moveCb) {
        c.elm._moveCb();
      }
      /* istanbul ignore if */
      if (c.elm._enterCb) {
        c.elm._enterCb();
      }
    }

    function recordPosition(c) {
      c.data.newPos = c.elm.getBoundingClientRect();
    }

    function applyTranslation(c) {
      var oldPos = c.data.pos;
      var newPos = c.data.newPos;
      var dx = oldPos.left - newPos.left;
      var dy = oldPos.top - newPos.top;
      if (dx || dy) {
        c.data.moved = true;
        var s = c.elm.style;
        s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
        s.transitionDuration = '0s';
      }
    }

    var platformComponents = {
      Transition: Transition,
      TransitionGroup: TransitionGroup
    };

    /*  */

    // install platform specific utils
    Vue$3.config.isUnknownElement = isUnknownElement;
    Vue$3.config.isReservedTag = isReservedTag;
    Vue$3.config.getTagNamespace = getTagNamespace;
    Vue$3.config.mustUseProp = mustUseProp;

    // install platform runtime directives & components
    extend(Vue$3.options.directives, platformDirectives);
    extend(Vue$3.options.components, platformComponents);

    // install platform patch function
    Vue$3.prototype.__patch__ = inBrowser ? patch$1 : noop;

    // wrap mount
    Vue$3.prototype.$mount = function (
      el,
      hydrating
    ) {
      el = el && inBrowser ? query(el) : undefined;
      return this._mount(el, hydrating)
    };

    if ("development" !== 'production' &&
      inBrowser && typeof console !== 'undefined') {
      console[console.info ? 'info' : 'log'](
        "You are running Vue in development mode.\n" +
        "Make sure to turn on production mode when deploying for production.\n" +
        "See more tips at https://vuejs.org/guide/deployment.html"
      );
    }

    // devtools global hook
    /* istanbul ignore next */
    setTimeout(function () {
      if (config.devtools) {
        if (devtools) {
          devtools.emit('init', Vue$3);
        } else if (
          "development" !== 'production' &&
          inBrowser && !isEdge && /Chrome\/\d+/.test(window.navigator.userAgent)
        ) {
          console[console.info ? 'info' : 'log'](
            'Download the Vue Devtools extension for a better development experience:\n' +
            'https://github.com/vuejs/vue-devtools'
          );
        }
      }
    }, 0);

    /*  */

    // check whether current browser encodes a char inside attribute values
    function shouldDecode(content, encoded) {
      var div = document.createElement('div');
      div.innerHTML = "<div a=\"" + content + "\">";
      return div.innerHTML.indexOf(encoded) > 0
    }

    // #3663
    // IE encodes newlines inside attribute values while other browsers don't
    var shouldDecodeNewlines = inBrowser ? shouldDecode('\n', '&#10;') : false;

    /*  */

    var decoder;

    function decode(html) {
      decoder = decoder || document.createElement('div');
      decoder.innerHTML = html;
      return decoder.textContent
    }

    /*  */

    var isUnaryTag = makeMap(
      'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
      'link,meta,param,source,track,wbr',
      true
    );

    // Elements that you can, intentionally, leave open
    // (and which close themselves)
    var canBeLeftOpenTag = makeMap(
      'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source',
      true
    );

    // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
    // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
    var isNonPhrasingTag = makeMap(
      'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
      'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
      'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
      'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
      'title,tr,track',
      true
    );

    /**
     * Not type-checking this file because it's mostly vendor code.
     */

    /*!
     * HTML Parser By John Resig (ejohn.org)
     * Modified by Juriy "kangax" Zaytsev
     * Original code by Erik Arvidsson, Mozilla Public License
     * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
     */

    // Regular Expressions for parsing tags and attributes
    var singleAttrIdentifier = /([^\s"'<>/=]+)/;
    var singleAttrAssign = /(?:=)/;
    var singleAttrValues = [
      // attr value double quotes
      /"([^"]*)"+/.source,
      // attr value, single quotes
      /'([^']*)'+/.source,
      // attr value, no quotes
      /([^\s"'=<>`]+)/.source
    ];
    var attribute = new RegExp(
      '^\\s*' + singleAttrIdentifier.source +
      '(?:\\s*(' + singleAttrAssign.source + ')' +
      '\\s*(?:' + singleAttrValues.join('|') + '))?'
    );

    // could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
    // but for Vue templates we can enforce a simple charset
    var ncname = '[a-zA-Z_][\\w\\-\\.]*';
    var qnameCapture = '((?:' + ncname + '\\:)?' + ncname + ')';
    var startTagOpen = new RegExp('^<' + qnameCapture);
    var startTagClose = /^\s*(\/?)>/;
    var endTag = new RegExp('^<\\/' + qnameCapture + '[^>]*>');
    var doctype = /^<!DOCTYPE [^>]+>/i;
    var comment = /^<!--/;
    var conditionalComment = /^<!\[/;

    var IS_REGEX_CAPTURING_BROKEN = false;
    'x'.replace(/x(.)?/g, function (m, g) {
      IS_REGEX_CAPTURING_BROKEN = g === '';
    });

    // Special Elements (can contain anything)
    var isScriptOrStyle = makeMap('script,style', true);
    var reCache = {};

    var ltRE = /&lt;/g;
    var gtRE = /&gt;/g;
    var nlRE = /&#10;/g;
    var ampRE = /&amp;/g;
    var quoteRE = /&quot;/g;

    function decodeAttr(value, shouldDecodeNewlines) {
      if (shouldDecodeNewlines) {
        value = value.replace(nlRE, '\n');
      }
      return value
        .replace(ltRE, '<')
        .replace(gtRE, '>')
        .replace(ampRE, '&')
        .replace(quoteRE, '"')
    }

    function parseHTML(html, options) {
      var stack = [];
      var expectHTML = options.expectHTML;
      var isUnaryTag$$1 = options.isUnaryTag || no;
      var index = 0;
      var last, lastTag;
      while (html) {
        last = html;
        // Make sure we're not in a script or style element
        if (!lastTag || !isScriptOrStyle(lastTag)) {
          var textEnd = html.indexOf('<');
          if (textEnd === 0) {
            // Comment:
            if (comment.test(html)) {
              var commentEnd = html.indexOf('-->');

              if (commentEnd >= 0) {
                advance(commentEnd + 3);
                continue
              }
            }

            // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
            if (conditionalComment.test(html)) {
              var conditionalEnd = html.indexOf(']>');

              if (conditionalEnd >= 0) {
                advance(conditionalEnd + 2);
                continue
              }
            }

            // Doctype:
            var doctypeMatch = html.match(doctype);
            if (doctypeMatch) {
              advance(doctypeMatch[0].length);
              continue
            }

            // End tag:
            var endTagMatch = html.match(endTag);
            if (endTagMatch) {
              var curIndex = index;
              advance(endTagMatch[0].length);
              parseEndTag(endTagMatch[1], curIndex, index);
              continue
            }

            // Start tag:
            var startTagMatch = parseStartTag();
            if (startTagMatch) {
              handleStartTag(startTagMatch);
              continue
            }
          }

          var text = (void 0), rest$1 = (void 0), next = (void 0);
          if (textEnd > 0) {
            rest$1 = html.slice(textEnd);
            while (
              !endTag.test(rest$1) &&
              !startTagOpen.test(rest$1) &&
              !comment.test(rest$1) &&
              !conditionalComment.test(rest$1)
            ) {
              // < in plain text, be forgiving and treat it as text
              next = rest$1.indexOf('<', 1);
              if (next < 0) { break }
              textEnd += next;
              rest$1 = html.slice(textEnd);
            }
            text = html.substring(0, textEnd);
            advance(textEnd);
          }

          if (textEnd < 0) {
            text = html;
            html = '';
          }

          if (options.chars && text) {
            options.chars(text);
          }
        } else {
          var stackedTag = lastTag.toLowerCase();
          var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
          var endTagLength = 0;
          var rest = html.replace(reStackedTag, function (all, text, endTag) {
            endTagLength = endTag.length;
            if (stackedTag !== 'script' && stackedTag !== 'style' && stackedTag !== 'noscript') {
              text = text
                .replace(/<!--([\s\S]*?)-->/g, '$1')
                .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
            }
            if (options.chars) {
              options.chars(text);
            }
            return ''
          });
          index += html.length - rest.length;
          html = rest;
          parseEndTag(stackedTag, index - endTagLength, index);
        }

        if (html === last && options.chars) {
          options.chars(html);
          break
        }
      }

      // Clean up any remaining tags
      parseEndTag();

      function advance(n) {
        index += n;
        html = html.substring(n);
      }

      function parseStartTag() {
        var start = html.match(startTagOpen);
        if (start) {
          var match = {
            tagName: start[1],
            attrs: [],
            start: index
          };
          advance(start[0].length);
          var end, attr;
          while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {
            advance(attr[0].length);
            match.attrs.push(attr);
          }
          if (end) {
            match.unarySlash = end[1];
            advance(end[0].length);
            match.end = index;
            return match
          }
        }
      }

      function handleStartTag(match) {
        var tagName = match.tagName;
        var unarySlash = match.unarySlash;

        if (expectHTML) {
          if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
            parseEndTag(lastTag);
          }
          if (canBeLeftOpenTag(tagName) && lastTag === tagName) {
            parseEndTag(tagName);
          }
        }

        var unary = isUnaryTag$$1(tagName) || tagName === 'html' && lastTag === 'head' || !!unarySlash;

        var l = match.attrs.length;
        var attrs = new Array(l);
        for (var i = 0; i < l; i++) {
          var args = match.attrs[i];
          // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
          if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
            if (args[3] === '') { delete args[3]; }
            if (args[4] === '') { delete args[4]; }
            if (args[5] === '') { delete args[5]; }
          }
          var value = args[3] || args[4] || args[5] || '';
          attrs[i] = {
            name: args[1],
            value: decodeAttr(
              value,
              options.shouldDecodeNewlines
            )
          };
        }

        if (!unary) {
          stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs });
          lastTag = tagName;
          unarySlash = '';
        }

        if (options.start) {
          options.start(tagName, attrs, unary, match.start, match.end);
        }
      }

      function parseEndTag(tagName, start, end) {
        var pos, lowerCasedTagName;
        if (start == null) { start = index; }
        if (end == null) { end = index; }

        if (tagName) {
          lowerCasedTagName = tagName.toLowerCase();
        }

        // Find the closest opened tag of the same type
        if (tagName) {
          for (pos = stack.length - 1; pos >= 0; pos--) {
            if (stack[pos].lowerCasedTag === lowerCasedTagName) {
              break
            }
          }
        } else {
          // If no tag name is provided, clean shop
          pos = 0;
        }

        if (pos >= 0) {
          // Close all the open elements, up the stack
          for (var i = stack.length - 1; i >= pos; i--) {
            if (options.end) {
              options.end(stack[i].tag, start, end);
            }
          }

          // Remove the open elements from the stack
          stack.length = pos;
          lastTag = pos && stack[pos - 1].tag;
        } else if (lowerCasedTagName === 'br') {
          if (options.start) {
            options.start(tagName, [], true, start, end);
          }
        } else if (lowerCasedTagName === 'p') {
          if (options.start) {
            options.start(tagName, [], false, start, end);
          }
          if (options.end) {
            options.end(tagName, start, end);
          }
        }
      }
    }

    /*  */

    function parseFilters(exp) {
      var inSingle = false;
      var inDouble = false;
      var inTemplateString = false;
      var inRegex = false;
      var curly = 0;
      var square = 0;
      var paren = 0;
      var lastFilterIndex = 0;
      var c, prev, i, expression, filters;

      for (i = 0; i < exp.length; i++) {
        prev = c;
        c = exp.charCodeAt(i);
        if (inSingle) {
          if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
        } else if (inDouble) {
          if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
        } else if (inTemplateString) {
          if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
        } else if (inRegex) {
          if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
        } else if (
          c === 0x7C && // pipe
          exp.charCodeAt(i + 1) !== 0x7C &&
          exp.charCodeAt(i - 1) !== 0x7C &&
          !curly && !square && !paren
        ) {
          if (expression === undefined) {
            // first filter, end of expression
            lastFilterIndex = i + 1;
            expression = exp.slice(0, i).trim();
          } else {
            pushFilter();
          }
        } else {
          switch (c) {
            case 0x22: inDouble = true; break         // "
            case 0x27: inSingle = true; break         // '
            case 0x60: inTemplateString = true; break // `
            case 0x28: paren++; break                 // (
            case 0x29: paren--; break                 // )
            case 0x5B: square++; break                // [
            case 0x5D: square--; break                // ]
            case 0x7B: curly++; break                 // {
            case 0x7D: curly--; break                 // }
          }
          if (c === 0x2f) { // /
            var j = i - 1;
            var p = (void 0);
            // find first non-whitespace prev char
            for (; j >= 0; j--) {
              p = exp.charAt(j);
              if (p !== ' ') { break }
            }
            if (!p || !/[\w$]/.test(p)) {
              inRegex = true;
            }
          }
        }
      }

      if (expression === undefined) {
        expression = exp.slice(0, i).trim();
      } else if (lastFilterIndex !== 0) {
        pushFilter();
      }

      function pushFilter() {
        (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
        lastFilterIndex = i + 1;
      }

      if (filters) {
        for (i = 0; i < filters.length; i++) {
          expression = wrapFilter(expression, filters[i]);
        }
      }

      return expression
    }

    function wrapFilter(exp, filter) {
      var i = filter.indexOf('(');
      if (i < 0) {
        // _f: resolveFilter
        return ("_f(\"" + filter + "\")(" + exp + ")")
      } else {
        var name = filter.slice(0, i);
        var args = filter.slice(i + 1);
        return ("_f(\"" + name + "\")(" + exp + "," + args)
      }
    }

    /*  */

    var defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g;
    var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;

    var buildRegex = cached(function (delimiters) {
      var open = delimiters[0].replace(regexEscapeRE, '\\$&');
      var close = delimiters[1].replace(regexEscapeRE, '\\$&');
      return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
    });

    function parseText(
      text,
      delimiters
    ) {
      var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
      if (!tagRE.test(text)) {
        return
      }
      var tokens = [];
      var lastIndex = tagRE.lastIndex = 0;
      var match, index;
      while ((match = tagRE.exec(text))) {
        index = match.index;
        // push text token
        if (index > lastIndex) {
          tokens.push(JSON.stringify(text.slice(lastIndex, index)));
        }
        // tag token
        var exp = parseFilters(match[1].trim());
        tokens.push(("_s(" + exp + ")"));
        lastIndex = index + match[0].length;
      }
      if (lastIndex < text.length) {
        tokens.push(JSON.stringify(text.slice(lastIndex)));
      }
      return tokens.join('+')
    }

    /*  */

    function baseWarn(msg) {
      console.error(("[Vue parser]: " + msg));
    }

    function pluckModuleFunction(
      modules,
      key
    ) {
      return modules
        ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
        : []
    }

    function addProp(el, name, value) {
      (el.props || (el.props = [])).push({ name: name, value: value });
    }

    function addAttr(el, name, value) {
      (el.attrs || (el.attrs = [])).push({ name: name, value: value });
    }

    function addDirective(
      el,
      name,
      rawName,
      value,
      arg,
      modifiers
    ) {
      (el.directives || (el.directives = [])).push({ name: name, rawName: rawName, value: value, arg: arg, modifiers: modifiers });
    }

    function addHandler(
      el,
      name,
      value,
      modifiers,
      important
    ) {
      // check capture modifier
      if (modifiers && modifiers.capture) {
        delete modifiers.capture;
        name = '!' + name; // mark the event as captured
      }
      if (modifiers && modifiers.once) {
        delete modifiers.once;
        name = '~' + name; // mark the event as once
      }
      var events;
      if (modifiers && modifiers.native) {
        delete modifiers.native;
        events = el.nativeEvents || (el.nativeEvents = {});
      } else {
        events = el.events || (el.events = {});
      }
      var newHandler = { value: value, modifiers: modifiers };
      var handlers = events[name];
      /* istanbul ignore if */
      if (Array.isArray(handlers)) {
        important ? handlers.unshift(newHandler) : handlers.push(newHandler);
      } else if (handlers) {
        events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
      } else {
        events[name] = newHandler;
      }
    }

    function getBindingAttr(
      el,
      name,
      getStatic
    ) {
      var dynamicValue =
        getAndRemoveAttr(el, ':' + name) ||
        getAndRemoveAttr(el, 'v-bind:' + name);
      if (dynamicValue != null) {
        return parseFilters(dynamicValue)
      } else if (getStatic !== false) {
        var staticValue = getAndRemoveAttr(el, name);
        if (staticValue != null) {
          return JSON.stringify(staticValue)
        }
      }
    }

    function getAndRemoveAttr(el, name) {
      var val;
      if ((val = el.attrsMap[name]) != null) {
        var list = el.attrsList;
        for (var i = 0, l = list.length; i < l; i++) {
          if (list[i].name === name) {
            list.splice(i, 1);
            break
          }
        }
      }
      return val
    }

    var len;
    var str;
    var chr;
    var index$1;
    var expressionPos;
    var expressionEndPos;

    /**
     * parse directive model to do the array update transform. a[idx] = val => $$a.splice($$idx, 1, val)
     *
     * for loop possible cases:
     *
     * - test
     * - test[idx]
     * - test[test1[idx]]
     * - test["a"][idx]
     * - xxx.test[a[a].test1[idx]]
     * - test.xxx.a["asa"][test1[idx]]
     *
     */

    function parseModel(val) {
      str = val;
      len = str.length;
      index$1 = expressionPos = expressionEndPos = 0;

      if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
        return {
          exp: val,
          idx: null
        }
      }

      while (!eof()) {
        chr = next();
        /* istanbul ignore if */
        if (isStringStart(chr)) {
          parseString(chr);
        } else if (chr === 0x5B) {
          parseBracket(chr);
        }
      }

      return {
        exp: val.substring(0, expressionPos),
        idx: val.substring(expressionPos + 1, expressionEndPos)
      }
    }

    function next() {
      return str.charCodeAt(++index$1)
    }

    function eof() {
      return index$1 >= len
    }

    function isStringStart(chr) {
      return chr === 0x22 || chr === 0x27
    }

    function parseBracket(chr) {
      var inBracket = 1;
      expressionPos = index$1;
      while (!eof()) {
        chr = next();
        if (isStringStart(chr)) {
          parseString(chr);
          continue
        }
        if (chr === 0x5B) { inBracket++; }
        if (chr === 0x5D) { inBracket--; }
        if (inBracket === 0) {
          expressionEndPos = index$1;
          break
        }
      }
    }

    function parseString(chr) {
      var stringQuote = chr;
      while (!eof()) {
        chr = next();
        if (chr === stringQuote) {
          break
        }
      }
    }

    /*  */

    var dirRE = /^v-|^@|^:/;
    var forAliasRE = /(.*?)\s+(?:in|of)\s+(.*)/;
    var forIteratorRE = /\((\{[^}]*\}|[^,]*),([^,]*)(?:,([^,]*))?\)/;
    var bindRE = /^:|^v-bind:/;
    var onRE = /^@|^v-on:/;
    var argRE = /:(.*)$/;
    var modifierRE = /\.[^.]+/g;

    var decodeHTMLCached = cached(decode);

    // configurable state
    var warn$1;
    var platformGetTagNamespace;
    var platformMustUseProp;
    var platformIsPreTag;
    var preTransforms;
    var transforms;
    var postTransforms;
    var delimiters;

    /**
     * Convert HTML string to AST.
     */
    function parse(
      template,
      options
    ) {
      warn$1 = options.warn || baseWarn;
      platformGetTagNamespace = options.getTagNamespace || no;
      platformMustUseProp = options.mustUseProp || no;
      platformIsPreTag = options.isPreTag || no;
      preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
      transforms = pluckModuleFunction(options.modules, 'transformNode');
      postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');
      delimiters = options.delimiters;
      var stack = [];
      var preserveWhitespace = options.preserveWhitespace !== false;
      var root;
      var currentParent;
      var inVPre = false;
      var inPre = false;
      var warned = false;
      parseHTML(template, {
        expectHTML: options.expectHTML,
        isUnaryTag: options.isUnaryTag,
        shouldDecodeNewlines: options.shouldDecodeNewlines,
        start: function start(tag, attrs, unary) {
          // check namespace.
          // inherit parent ns if there is one
          var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);

          // handle IE svg bug
          /* istanbul ignore if */
          if (isIE && ns === 'svg') {
            attrs = guardIESVGBug(attrs);
          }

          var element = {
            type: 1,
            tag: tag,
            attrsList: attrs,
            attrsMap: makeAttrsMap(attrs),
            parent: currentParent,
            children: []
          };
          if (ns) {
            element.ns = ns;
          }

          if (isForbiddenTag(element) && !isServerRendering()) {
            element.forbidden = true;
            "development" !== 'production' && warn$1(
              'Templates should only be responsible for mapping the state to the ' +
              'UI. Avoid placing tags with side-effects in your templates, such as ' +
              "<" + tag + ">" + ', as they will not be parsed.'
            );
          }

          // apply pre-transforms
          for (var i = 0; i < preTransforms.length; i++) {
            preTransforms[i](element, options);
          }

          if (!inVPre) {
            processPre(element);
            if (element.pre) {
              inVPre = true;
            }
          }
          if (platformIsPreTag(element.tag)) {
            inPre = true;
          }
          if (inVPre) {
            processRawAttrs(element);
          } else {
            processFor(element);
            processIf(element);
            processOnce(element);
            processKey(element);

            // determine whether this is a plain element after
            // removing structural attributes
            element.plain = !element.key && !attrs.length;

            processRef(element);
            processSlot(element);
            processComponent(element);
            for (var i$1 = 0; i$1 < transforms.length; i$1++) {
              transforms[i$1](element, options);
            }
            processAttrs(element);
          }

          function checkRootConstraints(el) {
            if ("development" !== 'production' && !warned) {
              if (el.tag === 'slot' || el.tag === 'template') {
                warned = true;
                warn$1(
                  "Cannot use <" + (el.tag) + "> as component root element because it may " +
                  'contain multiple nodes:\n' + template
                );
              }
              if (el.attrsMap.hasOwnProperty('v-for')) {
                warned = true;
                warn$1(
                  'Cannot use v-for on stateful component root element because ' +
                  'it renders multiple elements:\n' + template
                );
              }
            }
          }

          // tree management
          if (!root) {
            root = element;
            checkRootConstraints(root);
          } else if (!stack.length) {
            // allow root elements with v-if, v-else-if and v-else
            if (root.if && (element.elseif || element.else)) {
              checkRootConstraints(element);
              addIfCondition(root, {
                exp: element.elseif,
                block: element
              });
            } else if ("development" !== 'production' && !warned) {
              warned = true;
              warn$1(
                "Component template should contain exactly one root element:" +
                "\n\n" + template + "\n\n" +
                "If you are using v-if on multiple elements, " +
                "use v-else-if to chain them instead."
              );
            }
          }
          if (currentParent && !element.forbidden) {
            if (element.elseif || element.else) {
              processIfConditions(element, currentParent);
            } else if (element.slotScope) { // scoped slot
              currentParent.plain = false;
              var name = element.slotTarget || 'default'; (currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
            } else {
              currentParent.children.push(element);
              element.parent = currentParent;
            }
          }
          if (!unary) {
            currentParent = element;
            stack.push(element);
          }
          // apply post-transforms
          for (var i$2 = 0; i$2 < postTransforms.length; i$2++) {
            postTransforms[i$2](element, options);
          }
        },

        end: function end() {
          // remove trailing whitespace
          var element = stack[stack.length - 1];
          var lastNode = element.children[element.children.length - 1];
          if (lastNode && lastNode.type === 3 && lastNode.text === ' ') {
            element.children.pop();
          }
          // pop stack
          stack.length -= 1;
          currentParent = stack[stack.length - 1];
          // check pre state
          if (element.pre) {
            inVPre = false;
          }
          if (platformIsPreTag(element.tag)) {
            inPre = false;
          }
        },

        chars: function chars(text) {
          if (!currentParent) {
            if ("development" !== 'production' && !warned && text === template) {
              warned = true;
              warn$1(
                'Component template requires a root element, rather than just text:\n\n' + template
              );
            }
            return
          }
          // IE textarea placeholder bug
          /* istanbul ignore if */
          if (isIE &&
            currentParent.tag === 'textarea' &&
            currentParent.attrsMap.placeholder === text) {
            return
          }
          var children = currentParent.children;
          text = inPre || text.trim()
            ? decodeHTMLCached(text)
            // only preserve whitespace if its not right after a starting tag
            : preserveWhitespace && children.length ? ' ' : '';
          if (text) {
            var expression;
            if (!inVPre && text !== ' ' && (expression = parseText(text, delimiters))) {
              children.push({
                type: 2,
                expression: expression,
                text: text
              });
            } else if (text !== ' ' || children[children.length - 1].text !== ' ') {
              currentParent.children.push({
                type: 3,
                text: text
              });
            }
          }
        }
      });
      return root
    }

    function processPre(el) {
      if (getAndRemoveAttr(el, 'v-pre') != null) {
        el.pre = true;
      }
    }

    function processRawAttrs(el) {
      var l = el.attrsList.length;
      if (l) {
        var attrs = el.attrs = new Array(l);
        for (var i = 0; i < l; i++) {
          attrs[i] = {
            name: el.attrsList[i].name,
            value: JSON.stringify(el.attrsList[i].value)
          };
        }
      } else if (!el.pre) {
        // non root node in pre blocks with no attributes
        el.plain = true;
      }
    }

    function processKey(el) {
      var exp = getBindingAttr(el, 'key');
      if (exp) {
        if ("development" !== 'production' && el.tag === 'template') {
          warn$1("<template> cannot be keyed. Place the key on real elements instead.");
        }
        el.key = exp;
      }
    }

    function processRef(el) {
      var ref = getBindingAttr(el, 'ref');
      if (ref) {
        el.ref = ref;
        el.refInFor = checkInFor(el);
      }
    }

    function processFor(el) {
      var exp;
      if ((exp = getAndRemoveAttr(el, 'v-for'))) {
        var inMatch = exp.match(forAliasRE);
        if (!inMatch) {
          "development" !== 'production' && warn$1(
            ("Invalid v-for expression: " + exp)
          );
          return
        }
        el.for = inMatch[2].trim();
        var alias = inMatch[1].trim();
        var iteratorMatch = alias.match(forIteratorRE);
        if (iteratorMatch) {
          el.alias = iteratorMatch[1].trim();
          el.iterator1 = iteratorMatch[2].trim();
          if (iteratorMatch[3]) {
            el.iterator2 = iteratorMatch[3].trim();
          }
        } else {
          el.alias = alias;
        }
      }
    }

    function processIf(el) {
      var exp = getAndRemoveAttr(el, 'v-if');
      if (exp) {
        el.if = exp;
        addIfCondition(el, {
          exp: exp,
          block: el
        });
      } else {
        if (getAndRemoveAttr(el, 'v-else') != null) {
          el.else = true;
        }
        var elseif = getAndRemoveAttr(el, 'v-else-if');
        if (elseif) {
          el.elseif = elseif;
        }
      }
    }

    function processIfConditions(el, parent) {
      var prev = findPrevElement(parent.children);
      if (prev && prev.if) {
        addIfCondition(prev, {
          exp: el.elseif,
          block: el
        });
      } else {
        warn$1(
          "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
          "used on element <" + (el.tag) + "> without corresponding v-if."
        );
      }
    }

    function findPrevElement(children) {
      var i = children.length;
      while (i--) {
        if (children[i].type === 1) {
          return children[i]
        } else {
          if ("development" !== 'production' && children[i].text !== ' ') {
            warn$1(
              "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
              "will be ignored."
            );
          }
          children.pop();
        }
      }
    }

    function addIfCondition(el, condition) {
      if (!el.ifConditions) {
        el.ifConditions = [];
      }
      el.ifConditions.push(condition);
    }

    function processOnce(el) {
      var once = getAndRemoveAttr(el, 'v-once');
      if (once != null) {
        el.once = true;
      }
    }

    function processSlot(el) {
      if (el.tag === 'slot') {
        el.slotName = getBindingAttr(el, 'name');
        if ("development" !== 'production' && el.key) {
          warn$1(
            "`key` does not work on <slot> because slots are abstract outlets " +
            "and can possibly expand into multiple elements. " +
            "Use the key on a wrapping element instead."
          );
        }
      } else {
        var slotTarget = getBindingAttr(el, 'slot');
        if (slotTarget) {
          el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
        }
        if (el.tag === 'template') {
          el.slotScope = getAndRemoveAttr(el, 'scope');
        }
      }
    }

    function processComponent(el) {
      var binding;
      if ((binding = getBindingAttr(el, 'is'))) {
        el.component = binding;
      }
      if (getAndRemoveAttr(el, 'inline-template') != null) {
        el.inlineTemplate = true;
      }
    }

    function processAttrs(el) {
      var list = el.attrsList;
      var i, l, name, rawName, value, arg, modifiers, isProp;
      for (i = 0, l = list.length; i < l; i++) {
        name = rawName = list[i].name;
        value = list[i].value;
        if (dirRE.test(name)) {
          // mark element as dynamic
          el.hasBindings = true;
          // modifiers
          modifiers = parseModifiers(name);
          if (modifiers) {
            name = name.replace(modifierRE, '');
          }
          if (bindRE.test(name)) { // v-bind
            name = name.replace(bindRE, '');
            value = parseFilters(value);
            isProp = false;
            if (modifiers) {
              if (modifiers.prop) {
                isProp = true;
                name = camelize(name);
                if (name === 'innerHtml') { name = 'innerHTML'; }
              }
              if (modifiers.camel) {
                name = camelize(name);
              }
            }
            if (isProp || platformMustUseProp(el.tag, el.attrsMap.type, name)) {
              addProp(el, name, value);
            } else {
              addAttr(el, name, value);
            }
          } else if (onRE.test(name)) { // v-on
            name = name.replace(onRE, '');
            addHandler(el, name, value, modifiers);
          } else { // normal directives
            name = name.replace(dirRE, '');
            // parse arg
            var argMatch = name.match(argRE);
            if (argMatch && (arg = argMatch[1])) {
              name = name.slice(0, -(arg.length + 1));
            }
            addDirective(el, name, rawName, value, arg, modifiers);
            if ("development" !== 'production' && name === 'model') {
              checkForAliasModel(el, value);
            }
          }
        } else {
          // literal attribute
          {
            var expression = parseText(value, delimiters);
            if (expression) {
              warn$1(
                name + "=\"" + value + "\": " +
                'Interpolation inside attributes has been removed. ' +
                'Use v-bind or the colon shorthand instead. For example, ' +
                'instead of <div id="{{ val }}">, use <div :id="val">.'
              );
            }
          }
          addAttr(el, name, JSON.stringify(value));
        }
      }
    }

    function checkInFor(el) {
      var parent = el;
      while (parent) {
        if (parent.for !== undefined) {
          return true
        }
        parent = parent.parent;
      }
      return false
    }

    function parseModifiers(name) {
      var match = name.match(modifierRE);
      if (match) {
        var ret = {};
        match.forEach(function (m) { ret[m.slice(1)] = true; });
        return ret
      }
    }

    function makeAttrsMap(attrs) {
      var map = {};
      for (var i = 0, l = attrs.length; i < l; i++) {
        if ("development" !== 'production' && map[attrs[i].name] && !isIE) {
          warn$1('duplicate attribute: ' + attrs[i].name);
        }
        map[attrs[i].name] = attrs[i].value;
      }
      return map
    }

    function isForbiddenTag(el) {
      return (
        el.tag === 'style' ||
        (el.tag === 'script' && (
          !el.attrsMap.type ||
          el.attrsMap.type === 'text/javascript'
        ))
      )
    }

    var ieNSBug = /^xmlns:NS\d+/;
    var ieNSPrefix = /^NS\d+:/;

    /* istanbul ignore next */
    function guardIESVGBug(attrs) {
      var res = [];
      for (var i = 0; i < attrs.length; i++) {
        var attr = attrs[i];
        if (!ieNSBug.test(attr.name)) {
          attr.name = attr.name.replace(ieNSPrefix, '');
          res.push(attr);
        }
      }
      return res
    }

    function checkForAliasModel(el, value) {
      var _el = el;
      while (_el) {
        if (_el.for && _el.alias === value) {
          warn$1(
            "<" + (el.tag) + " v-model=\"" + value + "\">: " +
            "You are binding v-model directly to a v-for iteration alias. " +
            "This will not be able to modify the v-for source array because " +
            "writing to the alias is like modifying a function local variable. " +
            "Consider using an array of objects and use v-model on an object property instead."
          );
        }
        _el = _el.parent;
      }
    }

    /*  */

    var isStaticKey;
    var isPlatformReservedTag;

    var genStaticKeysCached = cached(genStaticKeys$1);

    /**
     * Goal of the optimizer: walk the generated template AST tree
     * and detect sub-trees that are purely static, i.e. parts of
     * the DOM that never needs to change.
     *
     * Once we detect these sub-trees, we can:
     *
     * 1. Hoist them into constants, so that we no longer need to
     *    create fresh nodes for them on each re-render;
     * 2. Completely skip them in the patching process.
     */
    function optimize(root, options) {
      if (!root) { return }
      isStaticKey = genStaticKeysCached(options.staticKeys || '');
      isPlatformReservedTag = options.isReservedTag || no;
      // first pass: mark all non-static nodes.
      markStatic(root);
      // second pass: mark static roots.
      markStaticRoots(root, false);
    }

    function genStaticKeys$1(keys) {
      return makeMap(
        'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +
        (keys ? ',' + keys : '')
      )
    }

    function markStatic(node) {
      node.static = isStatic(node);
      if (node.type === 1) {
        // do not make component slot content static. this avoids
        // 1. components not able to mutate slot nodes
        // 2. static slot content fails for hot-reloading
        if (
          !isPlatformReservedTag(node.tag) &&
          node.tag !== 'slot' &&
          node.attrsMap['inline-template'] == null
        ) {
          return
        }
        for (var i = 0, l = node.children.length; i < l; i++) {
          var child = node.children[i];
          markStatic(child);
          if (!child.static) {
            node.static = false;
          }
        }
      }
    }

    function markStaticRoots(node, isInFor) {
      if (node.type === 1) {
        if (node.static || node.once) {
          node.staticInFor = isInFor;
        }
        // For a node to qualify as a static root, it should have children that
        // are not just static text. Otherwise the cost of hoisting out will
        // outweigh the benefits and it's better off to just always render it fresh.
        if (node.static && node.children.length && !(
          node.children.length === 1 &&
          node.children[0].type === 3
        )) {
          node.staticRoot = true;
          return
        } else {
          node.staticRoot = false;
        }
        if (node.children) {
          for (var i = 0, l = node.children.length; i < l; i++) {
            markStaticRoots(node.children[i], isInFor || !!node.for);
          }
        }
        if (node.ifConditions) {
          walkThroughConditionsBlocks(node.ifConditions, isInFor);
        }
      }
    }

    function walkThroughConditionsBlocks(conditionBlocks, isInFor) {
      for (var i = 1, len = conditionBlocks.length; i < len; i++) {
        markStaticRoots(conditionBlocks[i].block, isInFor);
      }
    }

    function isStatic(node) {
      if (node.type === 2) { // expression
        return false
      }
      if (node.type === 3) { // text
        return true
      }
      return !!(node.pre || (
        !node.hasBindings && // no dynamic bindings
        !node.if && !node.for && // not v-if or v-for or v-else
        !isBuiltInTag(node.tag) && // not a built-in
        isPlatformReservedTag(node.tag) && // not a component
        !isDirectChildOfTemplateFor(node) &&
        Object.keys(node).every(isStaticKey)
      ))
    }

    function isDirectChildOfTemplateFor(node) {
      while (node.parent) {
        node = node.parent;
        if (node.tag !== 'template') {
          return false
        }
        if (node.for) {
          return true
        }
      }
      return false
    }

    /*  */

    var fnExpRE = /^\s*([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/;
    var simplePathRE = /^\s*[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?']|\[".*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*\s*$/;

    // keyCode aliases
    var keyCodes = {
      esc: 27,
      tab: 9,
      enter: 13,
      space: 32,
      up: 38,
      left: 37,
      right: 39,
      down: 40,
      'delete': [8, 46]
    };

    var modifierCode = {
      stop: '$event.stopPropagation();',
      prevent: '$event.preventDefault();',
      self: 'if($event.target !== $event.currentTarget)return;',
      ctrl: 'if(!$event.ctrlKey)return;',
      shift: 'if(!$event.shiftKey)return;',
      alt: 'if(!$event.altKey)return;',
      meta: 'if(!$event.metaKey)return;'
    };

    function genHandlers(events, native) {
      var res = native ? 'nativeOn:{' : 'on:{';
      for (var name in events) {
        res += "\"" + name + "\":" + (genHandler(name, events[name])) + ",";
      }
      return res.slice(0, -1) + '}'
    }

    function genHandler(
      name,
      handler
    ) {
      if (!handler) {
        return 'function(){}'
      } else if (Array.isArray(handler)) {
        return ("[" + (handler.map(function (handler) { return genHandler(name, handler); }).join(',')) + "]")
      } else if (!handler.modifiers) {
        return fnExpRE.test(handler.value) || simplePathRE.test(handler.value)
          ? handler.value
          : ("function($event){" + (handler.value) + "}")
      } else {
        var code = '';
        var keys = [];
        for (var key in handler.modifiers) {
          if (modifierCode[key]) {
            code += modifierCode[key];
          } else {
            keys.push(key);
          }
        }
        if (keys.length) {
          code = genKeyFilter(keys) + code;
        }
        var handlerCode = simplePathRE.test(handler.value)
          ? handler.value + '($event)'
          : handler.value;
        return 'function($event){' + code + handlerCode + '}'
      }
    }

    function genKeyFilter(keys) {
      return ("if(" + (keys.map(genFilterCode).join('&&')) + ")return;")
    }

    function genFilterCode(key) {
      var keyVal = parseInt(key, 10);
      if (keyVal) {
        return ("$event.keyCode!==" + keyVal)
      }
      var alias = keyCodes[key];
      return ("_k($event.keyCode," + (JSON.stringify(key)) + (alias ? ',' + JSON.stringify(alias) : '') + ")")
    }

    /*  */

    function bind$2(el, dir) {
      el.wrapData = function (code) {
        return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + (dir.modifiers && dir.modifiers.prop ? ',true' : '') + ")")
      };
    }

    /*  */

    var baseDirectives = {
      bind: bind$2,
      cloak: noop
    };

    /*  */

    // configurable state
    var warn$2;
    var transforms$1;
    var dataGenFns;
    var platformDirectives$1;
    var isPlatformReservedTag$1;
    var staticRenderFns;
    var onceCount;
    var currentOptions;

    function generate(
      ast,
      options
    ) {
      // save previous staticRenderFns so generate calls can be nested
      var prevStaticRenderFns = staticRenderFns;
      var currentStaticRenderFns = staticRenderFns = [];
      var prevOnceCount = onceCount;
      onceCount = 0;
      currentOptions = options;
      warn$2 = options.warn || baseWarn;
      transforms$1 = pluckModuleFunction(options.modules, 'transformCode');
      dataGenFns = pluckModuleFunction(options.modules, 'genData');
      platformDirectives$1 = options.directives || {};
      isPlatformReservedTag$1 = options.isReservedTag || no;
      var code = ast ? genElement(ast) : '_c("div")';
      staticRenderFns = prevStaticRenderFns;
      onceCount = prevOnceCount;
      return {
        render: ("with(this){return " + code + "}"),
        staticRenderFns: currentStaticRenderFns
      }
    }

    function genElement(el) {
      if (el.staticRoot && !el.staticProcessed) {
        return genStatic(el)
      } else if (el.once && !el.onceProcessed) {
        return genOnce(el)
      } else if (el.for && !el.forProcessed) {
        return genFor(el)
      } else if (el.if && !el.ifProcessed) {
        return genIf(el)
      } else if (el.tag === 'template' && !el.slotTarget) {
        return genChildren(el) || 'void 0'
      } else if (el.tag === 'slot') {
        return genSlot(el)
      } else {
        // component or element
        var code;
        if (el.component) {
          code = genComponent(el.component, el);
        } else {
          var data = el.plain ? undefined : genData(el);

          var children = el.inlineTemplate ? null : genChildren(el, true);
          code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
        }
        // module transforms
        for (var i = 0; i < transforms$1.length; i++) {
          code = transforms$1[i](el, code);
        }
        return code
      }
    }

    // hoist static sub-trees out
    function genStatic(el) {
      el.staticProcessed = true;
      staticRenderFns.push(("with(this){return " + (genElement(el)) + "}"));
      return ("_m(" + (staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
    }

    // v-once
    function genOnce(el) {
      el.onceProcessed = true;
      if (el.if && !el.ifProcessed) {
        return genIf(el)
      } else if (el.staticInFor) {
        var key = '';
        var parent = el.parent;
        while (parent) {
          if (parent.for) {
            key = parent.key;
            break
          }
          parent = parent.parent;
        }
        if (!key) {
          "development" !== 'production' && warn$2(
            "v-once can only be used inside v-for that is keyed. "
          );
          return genElement(el)
        }
        return ("_o(" + (genElement(el)) + "," + (onceCount++) + (key ? ("," + key) : "") + ")")
      } else {
        return genStatic(el)
      }
    }

    function genIf(el) {
      el.ifProcessed = true; // avoid recursion
      return genIfConditions(el.ifConditions.slice())
    }

    function genIfConditions(conditions) {
      if (!conditions.length) {
        return '_e()'
      }

      var condition = conditions.shift();
      if (condition.exp) {
        return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions)))
      } else {
        return ("" + (genTernaryExp(condition.block)))
      }

      // v-if with v-once should generate code like (a)?_m(0):_m(1)
      function genTernaryExp(el) {
        return el.once ? genOnce(el) : genElement(el)
      }
    }

    function genFor(el) {
      var exp = el.for;
      var alias = el.alias;
      var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
      var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
      el.forProcessed = true; // avoid recursion
      return "_l((" + exp + ")," +
        "function(" + alias + iterator1 + iterator2 + "){" +
        "return " + (genElement(el)) +
        '})'
    }

    function genData(el) {
      var data = '{';

      // directives first.
      // directives may mutate the el's other properties before they are generated.
      var dirs = genDirectives(el);
      if (dirs) { data += dirs + ','; }

      // key
      if (el.key) {
        data += "key:" + (el.key) + ",";
      }
      // ref
      if (el.ref) {
        data += "ref:" + (el.ref) + ",";
      }
      if (el.refInFor) {
        data += "refInFor:true,";
      }
      // pre
      if (el.pre) {
        data += "pre:true,";
      }
      // record original tag name for components using "is" attribute
      if (el.component) {
        data += "tag:\"" + (el.tag) + "\",";
      }
      // module data generation functions
      for (var i = 0; i < dataGenFns.length; i++) {
        data += dataGenFns[i](el);
      }
      // attributes
      if (el.attrs) {
        data += "attrs:{" + (genProps(el.attrs)) + "},";
      }
      // DOM props
      if (el.props) {
        data += "domProps:{" + (genProps(el.props)) + "},";
      }
      // event handlers
      if (el.events) {
        data += (genHandlers(el.events)) + ",";
      }
      if (el.nativeEvents) {
        data += (genHandlers(el.nativeEvents, true)) + ",";
      }
      // slot target
      if (el.slotTarget) {
        data += "slot:" + (el.slotTarget) + ",";
      }
      // scoped slots
      if (el.scopedSlots) {
        data += (genScopedSlots(el.scopedSlots)) + ",";
      }
      // inline-template
      if (el.inlineTemplate) {
        var inlineTemplate = genInlineTemplate(el);
        if (inlineTemplate) {
          data += inlineTemplate + ",";
        }
      }
      data = data.replace(/,$/, '') + '}';
      // v-bind data wrap
      if (el.wrapData) {
        data = el.wrapData(data);
      }
      return data
    }

    function genDirectives(el) {
      var dirs = el.directives;
      if (!dirs) { return }
      var res = 'directives:[';
      var hasRuntime = false;
      var i, l, dir, needRuntime;
      for (i = 0, l = dirs.length; i < l; i++) {
        dir = dirs[i];
        needRuntime = true;
        var gen = platformDirectives$1[dir.name] || baseDirectives[dir.name];
        if (gen) {
          // compile-time directive that manipulates AST.
          // returns true if it also needs a runtime counterpart.
          needRuntime = !!gen(el, dir, warn$2);
        }
        if (needRuntime) {
          hasRuntime = true;
          res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:\"" + (dir.arg) + "\"") : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
        }
      }
      if (hasRuntime) {
        return res.slice(0, -1) + ']'
      }
    }

    function genInlineTemplate(el) {
      var ast = el.children[0];
      if ("development" !== 'production' && (
        el.children.length > 1 || ast.type !== 1
      )) {
        warn$2('Inline-template components must have exactly one child element.');
      }
      if (ast.type === 1) {
        var inlineRenderFns = generate(ast, currentOptions);
        return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
      }
    }

    function genScopedSlots(slots) {
      return ("scopedSlots:{" + (Object.keys(slots).map(function (key) { return genScopedSlot(key, slots[key]); }).join(',')) + "}")
    }

    function genScopedSlot(key, el) {
      return key + ":function(" + (String(el.attrsMap.scope)) + "){" +
        "return " + (el.tag === 'template'
          ? genChildren(el) || 'void 0'
          : genElement(el)) + "}"
    }

    function genChildren(el, checkSkip) {
      var children = el.children;
      if (children.length) {
        var el$1 = children[0];
        // optimize single v-for
        if (children.length === 1 &&
          el$1.for &&
          el$1.tag !== 'template' &&
          el$1.tag !== 'slot') {
          return genElement(el$1)
        }
        var normalizationType = getNormalizationType(children);
        return ("[" + (children.map(genNode).join(',')) + "]" + (checkSkip
          ? normalizationType ? ("," + normalizationType) : ''
          : ''))
      }
    }

    // determine the normalization needed for the children array.
    // 0: no normalization needed
    // 1: simple normalization needed (possible 1-level deep nested array)
    // 2: full normalization needed
    function getNormalizationType(children) {
      var res = 0;
      for (var i = 0; i < children.length; i++) {
        var el = children[i];
        if (el.type !== 1) {
          continue
        }
        if (needsNormalization(el) ||
          (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
          res = 2;
          break
        }
        if (maybeComponent(el) ||
          (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
          res = 1;
        }
      }
      return res
    }

    function needsNormalization(el) {
      return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
    }

    function maybeComponent(el) {
      return !isPlatformReservedTag$1(el.tag)
    }

    function genNode(node) {
      if (node.type === 1) {
        return genElement(node)
      } else {
        return genText(node)
      }
    }

    function genText(text) {
      return ("_v(" + (text.type === 2
        ? text.expression // no need for () because already wrapped in _s()
        : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
    }

    function genSlot(el) {
      var slotName = el.slotName || '"default"';
      var children = genChildren(el);
      var res = "_t(" + slotName + (children ? ("," + children) : '');
      var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
      var bind$$1 = el.attrsMap['v-bind'];
      if ((attrs || bind$$1) && !children) {
        res += ",null";
      }
      if (attrs) {
        res += "," + attrs;
      }
      if (bind$$1) {
        res += (attrs ? '' : ',null') + "," + bind$$1;
      }
      return res + ')'
    }

    // componentName is el.component, take it as argument to shun flow's pessimistic refinement
    function genComponent(componentName, el) {
      var children = el.inlineTemplate ? null : genChildren(el, true);
      return ("_c(" + componentName + "," + (genData(el)) + (children ? ("," + children) : '') + ")")
    }

    function genProps(props) {
      var res = '';
      for (var i = 0; i < props.length; i++) {
        var prop = props[i];
        res += "\"" + (prop.name) + "\":" + (transformSpecialNewlines(prop.value)) + ",";
      }
      return res.slice(0, -1)
    }

    // #3895, #4268
    function transformSpecialNewlines(text) {
      return text
        .replace(/\u2028/g, '\\u2028')
        .replace(/\u2029/g, '\\u2029')
    }

    /*  */

    /**
     * Compile a template.
     */
    function compile$1(
      template,
      options
    ) {
      var ast = parse(template.trim(), options);
      optimize(ast, options);
      var code = generate(ast, options);
      return {
        ast: ast,
        render: code.render,
        staticRenderFns: code.staticRenderFns
      }
    }

    /*  */

    // operators like typeof, instanceof and in are allowed
    var prohibitedKeywordRE = new RegExp('\\b' + (
      'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
      'super,throw,while,yield,delete,export,import,return,switch,default,' +
      'extends,finally,continue,debugger,function,arguments'
    ).split(',').join('\\b|\\b') + '\\b');
    // check valid identifier for v-for
    var identRE = /[A-Za-z_$][\w$]*/;
    // strip strings in expressions
    var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;

    // detect problematic expressions in a template
    function detectErrors(ast) {
      var errors = [];
      if (ast) {
        checkNode(ast, errors);
      }
      return errors
    }

    function checkNode(node, errors) {
      if (node.type === 1) {
        for (var name in node.attrsMap) {
          if (dirRE.test(name)) {
            var value = node.attrsMap[name];
            if (value) {
              if (name === 'v-for') {
                checkFor(node, ("v-for=\"" + value + "\""), errors);
              } else {
                checkExpression(value, (name + "=\"" + value + "\""), errors);
              }
            }
          }
        }
        if (node.children) {
          for (var i = 0; i < node.children.length; i++) {
            checkNode(node.children[i], errors);
          }
        }
      } else if (node.type === 2) {
        checkExpression(node.expression, node.text, errors);
      }
    }

    function checkFor(node, text, errors) {
      checkExpression(node.for || '', text, errors);
      checkIdentifier(node.alias, 'v-for alias', text, errors);
      checkIdentifier(node.iterator1, 'v-for iterator', text, errors);
      checkIdentifier(node.iterator2, 'v-for iterator', text, errors);
    }

    function checkIdentifier(ident, type, text, errors) {
      if (typeof ident === 'string' && !identRE.test(ident)) {
        errors.push(("- invalid " + type + " \"" + ident + "\" in expression: " + text));
      }
    }

    function checkExpression(exp, text, errors) {
      try {
        new Function(("return " + exp));
      } catch (e) {
        var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
        if (keywordMatch) {
          errors.push(
            "- avoid using JavaScript keyword as property name: " +
            "\"" + (keywordMatch[0]) + "\" in expression " + text
          );
        } else {
          errors.push(("- invalid expression: " + text));
        }
      }
    }

    /*  */

    function transformNode(el, options) {
      var warn = options.warn || baseWarn;
      var staticClass = getAndRemoveAttr(el, 'class');
      if ("development" !== 'production' && staticClass) {
        var expression = parseText(staticClass, options.delimiters);
        if (expression) {
          warn(
            "class=\"" + staticClass + "\": " +
            'Interpolation inside attributes has been removed. ' +
            'Use v-bind or the colon shorthand instead. For example, ' +
            'instead of <div class="{{ val }}">, use <div :class="val">.'
          );
        }
      }
      if (staticClass) {
        el.staticClass = JSON.stringify(staticClass);
      }
      var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
      if (classBinding) {
        el.classBinding = classBinding;
      }
    }

    function genData$1(el) {
      var data = '';
      if (el.staticClass) {
        data += "staticClass:" + (el.staticClass) + ",";
      }
      if (el.classBinding) {
        data += "class:" + (el.classBinding) + ",";
      }
      return data
    }

    var klass$1 = {
      staticKeys: ['staticClass'],
      transformNode: transformNode,
      genData: genData$1
    };

    /*  */

    function transformNode$1(el, options) {
      var warn = options.warn || baseWarn;
      var staticStyle = getAndRemoveAttr(el, 'style');
      if (staticStyle) {
        /* istanbul ignore if */
        {
          var expression = parseText(staticStyle, options.delimiters);
          if (expression) {
            warn(
              "style=\"" + staticStyle + "\": " +
              'Interpolation inside attributes has been removed. ' +
              'Use v-bind or the colon shorthand instead. For example, ' +
              'instead of <div style="{{ val }}">, use <div :style="val">.'
            );
          }
        }
        el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
      }

      var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
      if (styleBinding) {
        el.styleBinding = styleBinding;
      }
    }

    function genData$2(el) {
      var data = '';
      if (el.staticStyle) {
        data += "staticStyle:" + (el.staticStyle) + ",";
      }
      if (el.styleBinding) {
        data += "style:(" + (el.styleBinding) + "),";
      }
      return data
    }

    var style$1 = {
      staticKeys: ['staticStyle'],
      transformNode: transformNode$1,
      genData: genData$2
    };

    var modules$1 = [
      klass$1,
      style$1
    ];

    /*  */

    var warn$3;

    function model$1(
      el,
      dir,
      _warn
    ) {
      warn$3 = _warn;
      var value = dir.value;
      var modifiers = dir.modifiers;
      var tag = el.tag;
      var type = el.attrsMap.type;
      {
        var dynamicType = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
        if (tag === 'input' && dynamicType) {
          warn$3(
            "<input :type=\"" + dynamicType + "\" v-model=\"" + value + "\">:\n" +
            "v-model does not support dynamic input types. Use v-if branches instead."
          );
        }
      }
      if (tag === 'select') {
        genSelect(el, value, modifiers);
      } else if (tag === 'input' && type === 'checkbox') {
        genCheckboxModel(el, value, modifiers);
      } else if (tag === 'input' && type === 'radio') {
        genRadioModel(el, value, modifiers);
      } else {
        genDefaultModel(el, value, modifiers);
      }
      // ensure runtime directive metadata
      return true
    }

    function genCheckboxModel(
      el,
      value,
      modifiers
    ) {
      if ("development" !== 'production' &&
        el.attrsMap.checked != null) {
        warn$3(
          "<" + (el.tag) + " v-model=\"" + value + "\" checked>:\n" +
          "inline checked attributes will be ignored when using v-model. " +
          'Declare initial values in the component\'s data option instead.'
        );
      }
      var number = modifiers && modifiers.number;
      var valueBinding = getBindingAttr(el, 'value') || 'null';
      var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
      var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
      addProp(el, 'checked',
        "Array.isArray(" + value + ")" +
        "?_i(" + value + "," + valueBinding + ")>-1" + (
          trueValueBinding === 'true'
            ? (":(" + value + ")")
            : (":_q(" + value + "," + trueValueBinding + ")")
        )
      );
      addHandler(el, 'click',
        "var $$a=" + value + "," +
        '$$el=$event.target,' +
        "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
        'if(Array.isArray($$a)){' +
        "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
        '$$i=_i($$a,$$v);' +
        "if($$c){$$i<0&&(" + value + "=$$a.concat($$v))}" +
        "else{$$i>-1&&(" + value + "=$$a.slice(0,$$i).concat($$a.slice($$i+1)))}" +
        "}else{" + value + "=$$c}",
        null, true
      );
    }

    function genRadioModel(
      el,
      value,
      modifiers
    ) {
      if ("development" !== 'production' &&
        el.attrsMap.checked != null) {
        warn$3(
          "<" + (el.tag) + " v-model=\"" + value + "\" checked>:\n" +
          "inline checked attributes will be ignored when using v-model. " +
          'Declare initial values in the component\'s data option instead.'
        );
      }
      var number = modifiers && modifiers.number;
      var valueBinding = getBindingAttr(el, 'value') || 'null';
      valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
      addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
      addHandler(el, 'click', genAssignmentCode(value, valueBinding), null, true);
    }

    function genDefaultModel(
      el,
      value,
      modifiers
    ) {
      {
        if (el.tag === 'input' && el.attrsMap.value) {
          warn$3(
            "<" + (el.tag) + " v-model=\"" + value + "\" value=\"" + (el.attrsMap.value) + "\">:\n" +
            'inline value attributes will be ignored when using v-model. ' +
            'Declare initial values in the component\'s data option instead.'
          );
        }
        if (el.tag === 'textarea' && el.children.length) {
          warn$3(
            "<textarea v-model=\"" + value + "\">:\n" +
            'inline content inside <textarea> will be ignored when using v-model. ' +
            'Declare initial values in the component\'s data option instead.'
          );
        }
      }

      var type = el.attrsMap.type;
      var ref = modifiers || {};
      var lazy = ref.lazy;
      var number = ref.number;
      var trim = ref.trim;
      var event = lazy || (isIE && type === 'range') ? 'change' : 'input';
      var needCompositionGuard = !lazy && type !== 'range';
      var isNative = el.tag === 'input' || el.tag === 'textarea';

      var valueExpression = isNative
        ? ("$event.target.value" + (trim ? '.trim()' : ''))
        : trim ? "(typeof $event === 'string' ? $event.trim() : $event)" : "$event";
      valueExpression = number || type === 'number'
        ? ("_n(" + valueExpression + ")")
        : valueExpression;

      var code = genAssignmentCode(value, valueExpression);
      if (isNative && needCompositionGuard) {
        code = "if($event.target.composing)return;" + code;
      }

      // inputs with type="file" are read only and setting the input's
      // value will throw an error.
      if ("development" !== 'production' &&
        type === 'file') {
        warn$3(
          "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
          "File inputs are read only. Use a v-on:change listener instead."
        );
      }

      addProp(el, 'value', isNative ? ("_s(" + value + ")") : ("(" + value + ")"));
      addHandler(el, event, code, null, true);
      if (trim || number || type === 'number') {
        addHandler(el, 'blur', '$forceUpdate()');
      }
    }

    function genSelect(
      el,
      value,
      modifiers
    ) {
      {
        el.children.some(checkOptionWarning);
      }

      var number = modifiers && modifiers.number;
      var assignment = "Array.prototype.filter" +
        ".call($event.target.options,function(o){return o.selected})" +
        ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
        "return " + (number ? '_n(val)' : 'val') + "})" +
        (el.attrsMap.multiple == null ? '[0]' : '');

      var code = genAssignmentCode(value, assignment);
      addHandler(el, 'change', code, null, true);
    }

    function checkOptionWarning(option) {
      if (option.type === 1 &&
        option.tag === 'option' &&
        option.attrsMap.selected != null) {
        warn$3(
          "<select v-model=\"" + (option.parent.attrsMap['v-model']) + "\">:\n" +
          'inline selected attributes on <option> will be ignored when using v-model. ' +
          'Declare initial values in the component\'s data option instead.'
        );
        return true
      }
      return false
    }

    function genAssignmentCode(value, assignment) {
      var modelRs = parseModel(value);
      if (modelRs.idx === null) {
        return (value + "=" + assignment)
      } else {
        return "var $$exp = " + (modelRs.exp) + ", $$idx = " + (modelRs.idx) + ";" +
          "if (!Array.isArray($$exp)){" +
          value + "=" + assignment + "}" +
          "else{$$exp.splice($$idx, 1, " + assignment + ")}"
      }
    }

    /*  */

    function text(el, dir) {
      if (dir.value) {
        addProp(el, 'textContent', ("_s(" + (dir.value) + ")"));
      }
    }

    /*  */

    function html(el, dir) {
      if (dir.value) {
        addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"));
      }
    }

    var directives$1 = {
      model: model$1,
      text: text,
      html: html
    };

    /*  */

    var cache = Object.create(null);

    var baseOptions = {
      expectHTML: true,
      modules: modules$1,
      staticKeys: genStaticKeys(modules$1),
      directives: directives$1,
      isReservedTag: isReservedTag,
      isUnaryTag: isUnaryTag,
      mustUseProp: mustUseProp,
      getTagNamespace: getTagNamespace,
      isPreTag: isPreTag
    };

    function compile$$1(
      template,
      options
    ) {
      options = options
        ? extend(extend({}, baseOptions), options)
        : baseOptions;
      return compile$1(template, options)
    }

    function compileToFunctions(
      template,
      options,
      vm
    ) {
      var _warn = (options && options.warn) || warn;
      // detect possible CSP restriction
      /* istanbul ignore if */
      {
        try {
          new Function('return 1');
        } catch (e) {
          if (e.toString().match(/unsafe-eval|CSP/)) {
            _warn(
              'It seems you are using the standalone build of Vue.js in an ' +
              'environment with Content Security Policy that prohibits unsafe-eval. ' +
              'The template compiler cannot work in this environment. Consider ' +
              'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
              'templates into render functions.'
            );
          }
        }
      }
      var key = options && options.delimiters
        ? String(options.delimiters) + template
        : template;
      if (cache[key]) {
        return cache[key]
      }
      var res = {};
      var compiled = compile$$1(template, options);
      res.render = makeFunction(compiled.render);
      var l = compiled.staticRenderFns.length;
      res.staticRenderFns = new Array(l);
      for (var i = 0; i < l; i++) {
        res.staticRenderFns[i] = makeFunction(compiled.staticRenderFns[i]);
      }
      {
        if (res.render === noop || res.staticRenderFns.some(function (fn) { return fn === noop; })) {
          _warn(
            "failed to compile template:\n\n" + template + "\n\n" +
            detectErrors(compiled.ast).join('\n') +
            '\n\n',
            vm
          );
        }
      }
      return (cache[key] = res)
    }

    function makeFunction(code) {
      try {
        return new Function(code)
      } catch (e) {
        return noop
      }
    }

    /*  */

    var idToTemplate = cached(function (id) {
      var el = query(id);
      return el && el.innerHTML
    });

    var mount = Vue$3.prototype.$mount;
    Vue$3.prototype.$mount = function (
      el,
      hydrating
    ) {
      el = el && query(el);

      /* istanbul ignore if */
      if (el === document.body || el === document.documentElement) {
        "development" !== 'production' && warn(
          "Do not mount Vue to <html> or <body> - mount to normal elements instead."
        );
        return this
      }

      var options = this.$options;
      // resolve template/el and convert to render function
      if (!options.render) {
        var template = options.template;
        if (template) {
          if (typeof template === 'string') {
            if (template.charAt(0) === '#') {
              template = idToTemplate(template);
              /* istanbul ignore if */
              if ("development" !== 'production' && !template) {
                warn(
                  ("Template element not found or is empty: " + (options.template)),
                  this
                );
              }
            }
          } else if (template.nodeType) {
            template = template.innerHTML;
          } else {
            {
              warn('invalid template option:' + template, this);
            }
            return this
          }
        } else if (el) {
          template = getOuterHTML(el);
        }
        if (template) {
          var ref = compileToFunctions(template, {
            warn: warn,
            shouldDecodeNewlines: shouldDecodeNewlines,
            delimiters: options.delimiters
          }, this);
          var render = ref.render;
          var staticRenderFns = ref.staticRenderFns;
          options.render = render;
          options.staticRenderFns = staticRenderFns;
        }
      }
      return mount.call(this, el, hydrating)
    };

    /**
     * Get outerHTML of elements, taking care
     * of SVG elements in IE as well.
     */
    function getOuterHTML(el) {
      if (el.outerHTML) {
        return el.outerHTML
      } else {
        var container = document.createElement('div');
        container.appendChild(el.cloneNode(true));
        return container.innerHTML
      }
    }

    Vue$3.compile = compileToFunctions;

    return Vue$3;

  })));
});